platelet

noun

A minute, nonnucleated, disklike cytoplasmic body found in the blood plasma of mammals that is derived from a megakaryocyte and functions to promote blood clotting.

noun

In anatomy, a little plate; a plaque or plaquette

noun

A small colorless disk-shaped particle found in the blood of mammals, which plays an important role in the formation of blood clots.

noun

tiny bits of protoplasm found in vertebrate blood; essential for blood clotting