IPA: /ˈwɛtˌstoʊn/
KK: /ˈwɛtˌstoʊn/
A type of stone used to sharpen the edges of tools and knives.
He used a whetstone to sharpen his kitchen knives before cooking.
Whetstone → The word is formed from "whet" (from Old English *hwettan*, meaning to sharpen) and "stone" (from Old English *stan*, meaning rock or stone). A whetstone is a stone used to sharpen blades or tools.
Think of 'sharpening' something with a 'stone' — that's what a whetstone does.