The Collaborative International Dictionary of English v.0.48:

Microcyte \Mi"cro*cyte\, n. [Micro- + Gr. ? a hollow vessel.]
   (Physiol.)
   One of the elementary granules found in blood. They are much
   smaller than an ordinary corpuscle, and are particularly
   noticeable in disease, as in anaemia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

microcyte
    n 1: an abnormally small red blood cell (less than 5 microns in
         diameter)