Definition: (noun) A heavy tool of stone or iron (usually with a flat base and a handle) that is used to grind and mix material (as grain or drugs or pigments) against a slab of stone.
Synonyms: pounder, muller.
Usage: Sometimes she might have been seen … kneading poee-poee with terrific vehemence, dashing the stone pestle about as if she would shiver the vessel into fragments.
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Source: The Free Dictionary