pestle
Concise Oxford English Dictionary © 2008 Oxford University Press:
pestle /ˈpɛs(ə)l/
▶noun a heavy tool with a rounded end, used for crushing and grinding substances in a mortar.
■ a mechanical device for grinding, pounding, or stamping.
▶verb crush or grind with a pestle.– origin ME: from OFr. pestel, from L. pistillum, from pist-, pinsere ‘to pound’.
'pestle' also found in these Oxford entries:

