中なか砥と

noun

medium-grade whetstone; medium sharpening stone

A sharpening stone of medium coarseness, used between rough and fine stones in a sharpening progression.

• 包ほう丁ちょうを研とぐときは、まず荒あら砥と、次つぎに中なか砥と、最さい後ごに仕し上あげ砥とを使つかいます。

  When sharpening a kitchen knife, first use a coarse stone, then a medium stone, and finally a finishing stone.