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Of or relating to a system of sexual determination in which diploid females develop from fertilized eggs and haploid males develop from unfertilized eggs, as in most hymenopterans, such as ants and bees, and certain other invertebrates.
A haplodiploid organism or species.
[From Greek haploos, single; see haploid + diploos, double; see diploid + -oid.]
hap′lo·dip′loi′dy (-loi′dē) n.