We don't have synonyms for heterogamous yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are heteronomous, heterogenous and heteronymous.
(adj) :
(biology) involving heterogametes in the reproductive process
(adj) :
(biology) characterized by alternating generations of a parthenogenetic and sexual nature
(adj) :
(botany) in which the stamens and pistils are not present in every flower; i.e. there are male and female flowers
(adj) :
in the daisy family Asteraceae, having two types of flowers in a flower head (such as some sterile, some hermaphrodite, or some female, some hermaphrodite)
(adj) :
(biology) involving heterogametes in the reproductive process
(adj) :
(biology) characterized by alternating generations of a parthenogenetic and sexual nature
(adj) :
(botany) in which the stamens and pistils are not present in every flower; i.e. there are male and female flowers
(adj) :
in the daisy family Asteraceae, having two types of flowers in a flower head (such as some sterile, some hermaphrodite, or some female, some hermaphrodite)