haplodiploidPronunciation: /ˌhaplə(ʊ)ˈdɪplɔɪd/Definition of haplodiploid adjective Biology denoting or possessing a genetic system in which females develop from fertilized (diploid) eggs and males from unfertilized (haploid) ones. haplodiploid in other Oxford dictionaries Definition of haplodiploid in the US English dictionary