definitive host definitive • definitively · · · Info · Definitions · Characters · · definitive host · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) the host in which the sexual reproduction of a parasite takes place. Synonyms: definitive host. · · Noun Definition 1 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076