whetstone

[ hwet-stohn, wet- ]
/ ˈʰwɛtˌstoʊn, ˈwɛt- /

noun

a stone for sharpening cutlery or tools by friction.
anything that sharpens: a whetstone for dull wits.

Origin of whetstone

before 900; Middle English whetston, Old English hwetstān. See whet, stone

Example sentences from the Web for whetstone

British Dictionary definitions for whetstone

whetstone
/ (ˈwɛtˌstəʊn) /

noun

a stone used for sharpening edged tools, knives, etc
something that sharpens