leucocyte

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. [ 1913 Webster ]

☞ They all consist of more or less spherical masses of protoplasm, without any surrounding membrane or wall, and are capable of motion. [ 1913 Webster ]