allodiploid /al′ōdip″loid/ [Gk, allos, other, diploos, double, eidos, form] , 1. an individual, an organism, a strain, or a cell that has two genetically distinct sets of chromosomes derived from different ancestral species, as occurs in hybridization. Compare allopolyploid, autodiploid. 2. also pertaining to such an individual, an organism, a strain, or a cell. −allodiploidy, n.