مِسَنٌّ

A whetstone; i. e. a stone, (S, M, L, Msb,) or anything, (K,) with which, (S, K,) or upon which, (M, L, Msb, K,) one sharpens, or whets, or makes sharp-pointed, (S, M, L, Msb, K,) and polishes, (M, L, K,) a knife and the like; (Msb;) and ↓ سِنَانٌ signifies the same. (S, M, L.)