hyperploid /hī″pərploid/ [Gk, hyper + eidos, form] , 1. n., an individual, organism, strain, or cell that has one or more chromosomes in excess of the haploid number or of an exact multiple of the haploid number characteristic of the species. The result is one or more unbalanced sets of chromosomes, which are referred to as hyperdiploid, hypertetraploid, hypertriploid, and so on, depending on the number of multiples of the haploid number they contain. 2. adj., pertaining to such an individual, organism, strain, or cell. Compare hypoploid. See also trisomy. −hyperploidy, adj.
