Leu"co*cyte (lū"k&osl;*sīt), n. [Leuco- + Gr. ky`tos a hollow vessel.] (Physiol.) A colorless corpuscle, as one of the white blood corpuscles, or those found in lymph, marrow of bone, connective tissue, etc.

&fist; They all consist of more or less spherical masses of protoplasm, without any surrounding membrane or wall, and are capable of motion.