砥と石いし

noun

whetstone; grindstone; sharpening stone

A stone used for sharpening blades such as knives, chisels, or swords. Both natural and synthetic stones are called 砥石.

• 包ほう丁ちょうを砥と石いしで研とぐ。

  I sharpen the kitchen knife on a whetstone.

• この砥と石いしは目めの粗あらさが違ちがう面めんがある。

  This whetstone has sides with different grits.