machine consisting of a heavy bar that moves vertically for pounding or crushing ores
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
a club-shaped hand tool for grinding and mixing substances in a mortar
grind, mash or pulverize in a mortar;
"pestle the garlic"
He ground the rock candy with a mortar and pestle.
A pestle can be ground into a needle and true knowledge comes from perseverance.