The Collaborative International Dictionary of English v.0.48:

Merozoite \Mer`o*zo"ite\, n. [Gr. me`ros part + Sporozoa.]
   (Zool.)
   A form of spore, usually elongate or falciform, and somewhat
   amoeboid, produced by segmentation of the schizonts of
   certain Sporozoa, as the malaria parasite.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

merozoite
    n 1: a cell that arises from the asexual division of a parent
         sporozoan during its life cycle