A mortar and pestle with black peppercorns.
Via Old French pestel, from Latin pistillum, from pīnsō (“pound, beat”). Cognate to pesto.
pestle (plural pestles)
- A club-shaped, round-headed stick used in a mortar to pound, crush, rub or grind things.
Coordinate terms 
instrument used with a mortar to grind things
pestle (third-person singular simple present pestles, present participle pestling, simple past and past participle pestled)
- To pound, crush, rub or grind (things), as in a mortar with a pestle.
Related terms 
- ^ “pestle” in Douglas Harper, Online Etymology Dictionary (2001).