trophozoitePronunciation: /ˌtrɒfə(ʊ)ˈzəʊʌɪt, ˌtrəʊfə(ʊ)-/Definition of trophozoite noun Zoology & Medicine a growing stage in the life cycle of some sporozoan parasites, when they are absorbing nutrients from the host. trophozoite in other Oxford dictionaries Definition of trophozoite in the US English dictionary