The Collaborative International Dictionary of English v.0.48:

Sporozoite \Spo`ro*zo"ite\ (sp[=o]`r[-o]*z[=o]"[imac]t), n.
   (Zool.)
   In certain Sporozoa, a small active, usually elongate,
   sickle-shaped or somewhat amoeboid spore, esp. one of those
   produced by division of the passive spores into which the
   zygote divides. The sporozoites reproduce asexually.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

sporozoite
    n 1: one of the minute active bodies into which sporozoans
         divide in one stage of their life cycle