heterogametic
Concise Oxford English Dictionary © 2008 Oxford University Press:
heterogametic /ˌhɛt(ə)rə(ʊ)gəˈmɛtɪk/
▶adjective Biology denoting the sex which has sex chromosomes that differ in morphology, e.g. (in mammals) the male and (in birds) the female.
'heterogametic' also found in these Oxford entries:

