an infective body or group of cells released from spores in many sporozoans and formed by the division of a zygote: it is the infective stage of the malaria parasite
See sporozoite in American Heritage Dictionary 4
(spôrˌə-zōˈītˌ, spōrˌ-)
noun
Any of the minute undeveloped sporozoans produced by multiple fission of a zygote or spore, especially at the stage just before it infects a new host cell.