Pestle/ˈpesl/ Definition 1 of 2Pro Tip 1/3Kitchen Essential A pestle is often found in kitchens for culinary purposes. The chef used a pestle to make the guacamole. Pro Tip 2/3Physical Action Using a pestle involves a physical action of pressing or twisting. She applied pressure to the pestle to crush the seeds. Pro Tip 3/3Material Variance Pestles can be made of wood, stone, or metal, each affecting the food differently. His granite pestle was perfect for grinding tough spices.