diplohaplontic Syllabification: (dip·lo·hap·lon·tic)Pronunciation: /ˌdiplōhapˈläntik/Definition of diplohaplontic adjective Genetics (of an alga or other lower plant) having a life cycle in which full-grown haploid and diploid forms alternate. Compare with diplontic and haplontic.diplohaplontic in other Oxford dictionaries Definition of diplohaplontic in the British & World English dictionary