Definition of pestle noun from the Oxford Advanced Learner's Dictionary

 

pestle

 noun
noun
BrE BrE//ˈpesl//
 
; NAmE NAmE//ˈpesl//
 
 
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a small heavy tool with a round end used for crushing things in a special bowl called a mortar Word Origin Middle English: from Old French pestel, from Latin pistillum, from pist- ‘pounded’, from the verb pinsere.
See the Oxford Advanced American Dictionary entry: pestle