DISK

n. flat circular object; circular object of covered in magnetic material and used for storing computer data (Computers); central part of a flower head; (Anatomy) flat round cartilage structure in the skeleton of a person or animal separating vertebraes in the spine; (Biology) circular structure in plants or animals (as blood disk); discus, round metal disc which is thrown in athletic competitions; (Agriculture) circular steel blade having a sharp edge used on a plow or disk harrow