rounder
‘one that rounds, especially a tool for rounding corner sand edges’
Lexical development traced from the Tamil root:
E. roonde, rount, rond, rounde, rownd < (agent noun from) round < A.F. rounde, O.F. roont < redond < Vulgar Lat. retundus < Lat. rotundus ‘like a wheel, circular, round,’ related to Lat. rota ‘a wheel, a potter’s wheel; wheel for torture’< rawnd < ret- < Tamil uruḷ