The DICT Development Group

  Leucocyte \Leu"co*cyte\ (l[=u]"k[-o]*s[imac]t), 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]
  
     Note: They all consist of more or less spherical masses of
           protoplasm, without any surrounding membrane or wall,
           and are capable of motion.
           [1913 Webster] Leucocythaemia

  leucocyte
      n 1: blood cells that engulf and digest bacteria and fungi; an
           important part of the body's defense system [syn:
           leukocyte, leucocyte, white blood cell, white cell,
           white blood corpuscle, white corpuscle, WBC]