Whether you are new to Japanese knives or have been collecting for years, the terminology can be a lot to absorb. This glossary covers the most important Japanese knife terms you will encounter when shopping for kitchen knives, reading about blade steels, or learning to sharpen. We have organized the terms by category to make it easy to find what you are looking for. If you have a question that is not answered here, feel free to contact us — we are always happy to help.

KNIFE TYPES

Gyuto — The Japanese equivalent of a Western chef’s knife and one of the most versatile knives in any kitchen. Used for meat, fish, and vegetables, the Gyuto typically ranges from 210–270mm in length and features a relatively thin blade with a slight curve to the edge. It is a great first Japanese knife for cooks coming from a Western background.

Santoku — Meaning “three virtues” in Japanese, referring to its ability to handle meat, fish, and vegetables. The Santoku is shorter and more compact than a Gyuto, with a flatter edge profile and a rounded or sheepsfoot tip. Popular in home kitchens and a good all-purpose choice for cooks who prefer a shorter blade.

Nakiri — A rectangular, flat-bladed vegetable knife built for push-cutting and chopping. The squared-off tip and fully flat edge make it ideal for clean board contact cuts and processing large quantities of produce.

Bunka — A versatile all-purpose knife similar in size to the Santoku but featuring a reverse tanto point, also called a k-tip. The angled tip provides more precision for detail work than the rounded Santoku tip.

Petty — A small utility knife used for detail work, peeling, trimming, and small prep tasks. Typically 120–180mm in length, the Petty is the Japanese equivalent of a Western paring or utility knife.

Sujihiki — A long, narrow slicing knife designed to break down proteins and slice fish or meat in long, smooth strokes. The Japanese counterpart to a Western carving or slicing knife, typically 240–300mm in length.

Yanagiba — A long, single-bevel slicer and one of the most iconic traditional Japanese knife forms. The Yanagiba is used primarily for slicing raw fish for sashimi and sushi, producing clean cuts with minimal tearing. Most commonly associated with professional Japanese cuisine.

Deba — A thick, heavy single-bevel knife designed for breaking down whole fish, including cutting through bone. The Deba is not intended for fine slicing work — its strength is in portioning whole fish efficiently.

Honesuki — A boning knife designed specifically for breaking down poultry. It features a stiff, triangular blade with a sharp tip for navigating joints cleanly.

Garasuki — Similar in design to the Honesuki but larger and heavier, the Garasuki is used for breaking down larger cuts of poultry or meat.

Kiritsuke — A long multipurpose knife with an angled, flat k-tip. Traditionally a single-bevel knife reserved for executive chefs in Japanese professional kitchens, modern double-bevel versions are now widely available and popular with home cooks and professionals alike.

Kiritsuke Gyuto — A hybrid knife that combines the length and versatility of a Gyuto with the distinctive k-tip profile of a Kiritsuke. Offers the best of both styles.

Kiritsuke Yanagiba — A long single-bevel slicer that combines the profile of a Kiritsuke tip with the length and slicing geometry of a Yanagiba.

Wa-Gyuto — A Gyuto fitted with a traditional Japanese wa-style handle rather than a Western yo-style handle. Lighter overall and preferred by many cooks for its balance and feel.

Cleaver / Chuka Bocho — A broad, rectangular blade used for chopping vegetables and light meat work. The Japanese-style cleaver is significantly lighter than a Western meat cleaver and is not intended for heavy bone cutting.

Takohiki — A long, single-bevel knife similar to the Yanagiba but with a squared-off tip rather than a pointed one. Traditionally associated with the Kanto region of Japan and used for slicing octopus and fish.

Mioroshi Deba — A hybrid knife that falls between a Deba and a Yanagiba. Thinner than a standard Deba, it is used for both filleting fish and slicing.




BLADE GEOMETRY AND GRINDS



Bevel — The angled surface ground into the blade to form the cutting edge. The geometry of the bevel has a major influence on how a knife cuts and how it is sharpened.

Single Bevel — A blade that is ground on one side only, with the opposite side left flat. Single-bevel construction is traditional to Japanese cutlery and produces an exceptionally sharp, precise edge. These knives require a different sharpening technique than double-bevel knives and are typically handed (right or left).

Double Bevel — A blade ground on both sides, similar in concept to most Western knives. Double-bevel Japanese knives are more accessible for general use and can be sharpened by either hand.

Shinogi — The ridge line that runs along the blade separating the flat or hollow upper portion from the ground bevel below. The shinogi line is one of the most defining features of Japanese blade geometry and plays an important role in how the knife moves through food.

Hamaguri (Convex Grind) — A blade profile where the bevel curves gently outward like the surface of a clamshell, rather than being flat or concave. The hamaguri grind adds durability to the edge and improves food release.

Urasuki — A very slight hollow ground into the flat back side of a single-bevel blade. The urasuki reduces drag during cutting and helps the blade maintain clean contact with the cutting board.

Ura — The flat back side of a single-bevel blade. Keeping the ura properly maintained is an important part of caring for single-bevel knives.

Hira — The flat side panel of the blade between the spine and the shinogi line.

Kasumi — Meaning “mist” or “haze,” this term describes the misty, frosted appearance of the softer cladding steel on a traditionally finished blade, contrasting with the mirror-polished cutting edge. Kasumi finishing is a hallmark of high-quality traditional Japanese knives.

Kireba — The lower portion of the blade face below the shinogi line — the primary bevel area where most of the grinding and sharpening work takes place.




STEEL AND METALLURGY



Hagane — The hard cutting steel, typically high-carbon, that forms the actual cutting edge in a laminated or clad blade. The quality and type of hagane is one of the primary factors in a knife’s edge performance.

Jigane — The softer cladding steel that surrounds or wraps the hagane core. The jigane provides toughness, protects the harder core steel, and contributes to the appearance of the finished blade.

Honyaki — A blade forged entirely from a single steel without any cladding. Typically made from high-carbon steel, honyaki knives are considered a premium construction method. They require expert sharpening and careful use, as the hardness that gives them outstanding edge retention also makes them more brittle.

San Mai — Meaning “three layers.” A lamination method in which a hard hagane core is sandwiched between two layers of softer jigane cladding. San mai construction is the most common form used in high-quality Japanese knives.

Ni Mai — Meaning “two layers.” Used primarily for single-bevel knives, where the hagane is bonded to one layer of softer cladding steel.

Damascus — A pattern-welded steel created by folding and forge-welding alternating layers of different steels together, producing a visible layered or flowing pattern on the blade surface. Damascus construction is valued both aesthetically and for the combination of hard and tough steel properties.

White Steel (Shirogami) — A very pure high-carbon steel prized for its ability to take an extremely sharp edge. White Steel is more reactive than stainless options and will develop a patina with use — it requires regular drying and occasional light oiling to prevent rust. Available in #1 (harder, more wear resistant) and #2 (slightly tougher) grades.

Blue Steel (Aogami) — A high-carbon steel with added chromium and tungsten, giving it improved edge retention and slightly better corrosion resistance compared to White Steel. A favorite among both professional chefs and serious home cooks. Available in #1, #2, and Super grades.

Aogami Super (AS) — The highest grade of Blue Steel, with added molybdenum and vanadium for exceptional edge retention and wear resistance. One of the most popular steels among Japanese knife enthusiasts.

R2 / SG2 — A powdered metallurgy stainless steel known for very high hardness (typically 63–65 HRC) and excellent edge retention while remaining largely resistant to staining and rust. A top choice for cooks who want high performance with easier maintenance.

VG10 — A popular stainless steel alloy widely used in Japanese production knives. Offers a good balance of hardness, edge retention, and corrosion resistance, making it an approachable entry point into Japanese knife steels.

ZDP-189 — An extremely hard powdered stainless steel capable of reaching 67+ HRC. ZDP-189 holds an exceptional edge but is more brittle than most other steels and requires careful use on appropriate cutting surfaces.

HRC (Rockwell Hardness) — The standard scale for measuring steel hardness. Japanese knives typically range from 58–67+ HRC. Higher hardness generally means better edge retention but increased brittleness — the right balance depends on how and where the knife will be used.

Reactive Steel — A carbon steel that will oxidize and develop a patina with exposure to moisture, acids, and food. A healthy patina can actually improve corrosion resistance over time and is considered a normal part of owning a carbon steel knife.

Stainless Steel — Steel with sufficient chromium content (typically 13% or higher) to resist corrosion. Stainless Japanese knives are more forgiving in wet kitchen environments and require less maintenance, though some grades sacrifice a degree of edge retention compared to high-carbon steels.




HANDLE TERMS



Wa Handle — A traditional Japanese handle, typically octagonal, oval, or D-shaped in cross section. Wa handles are made from wood — most commonly ho wood — and are notably lightweight, which shifts the balance point of the knife forward toward the blade. They allow for a natural pinch grip close to the blade.

Yo Handle — A Western-style full-tang handle with rivets, familiar to cooks who have used European knives. Yo handles are generally heavier than wa handles and provide a more familiar feel for cooks transitioning from Western cutlery.

Ho Wood — Magnolia wood, the traditional material for wa handles in Japan. Ho wood is lightweight, slightly absorbent, and easy to replace when worn. Most wa handles use a ho wood core regardless of any decorative outer material.

Ferrule — The collar or band between the handle and the blade, typically made from buffalo horn, synthetic materials, or plastic. The ferrule prevents the handle from cracking at the junction point and adds a finished look to the knife.

Machi — A small notch or step between the blade and the tang that sits at the front of the handle collar on a wa-handled knife. The machi is a distinctive feature of traditional Japanese knife construction.

Tang — The portion of the blade steel that extends into the handle. Wa knives typically have a narrow push tang; yo knives typically have a full tang that runs the full length and width of the handle.




FINISH AND AESTHETICS



Kurouchi — A rustic black forge scale finish left on the blade from the forging process. Kurouchi provides some protection to the blade above the edge and gives the knife a traditional, handcrafted appearance. It will gradually wear away with use over time.

Tsuchime — A hammered finish applied to the blade surface, creating a dimpled or textured pattern. Tsuchime helps reduce food sticking to the sides of the blade and adds a great deal of visual character.

Migaki — A polished finish on the blade, ranging from a refined satin to a near-mirror polish depending on the maker and the grade of the knife.

Nashiji — A textured finish applied to the cladding that resembles the speckled skin of a Japanese pear (nashi). Creates a subtle, attractive surface pattern often seen on mid-range and high-end knives.

Suminagashi — A flowing, marbled Damascus pattern created through layer folding and acid etching. Highly decorative and one of the most visually striking finishes available on Japanese knives.




SHARPENING AND MAINTENANCE



Whetstone — The preferred and recommended method for sharpening Japanese knives. Whetstones are available in coarse (120–400 grit) for repairing damaged edges, medium (800–2000 grit) for regular sharpening, and fine to extra-fine (3000–8000+ grit) for polishing and refining an edge.

Nagura — A small conditioning stone used to raise a slurry on the surface of a whetstone. The slurry improves the stone’s cutting action and helps achieve a finer, more polished edge.

Strop — A leather or wooden paddle used after sharpening to align and refine the cutting edge. Strops are often loaded with a polishing compound and are one of the easiest ways to maintain sharpness between full sharpening sessions.

Burr (Wire Edge) — A thin curl of metal that forms on the opposite side of the bevel during sharpening, indicating that the edge has been fully worked on that side. The burr must be removed for a clean, sharp edge — this is done through light deburring strokes.

Deburring — The process of removing the burr after sharpening, using light alternating strokes on the stone, a strop, or a piece of wood. Proper deburring is the final step in producing a clean, refined edge.

Patina — A dark, oxidized layer that develops naturally on carbon steel blades through regular use and exposure to food and moisture. A stable patina is not a sign of neglect — it actually helps protect the steel from further oxidation and is considered a normal and desirable part of owning a carbon steel knife.

Saya — A wooden sheath or scabbard used to protect the blade during storage and transport. A saya is an essential accessory for Japanese knives, particularly single-bevel styles, and helps preserve the edge between uses.