euploid /yo̅o̅″ploid/ [Gk, eu + ploos, multiple] , 1. n., an individual, organism, strain, or cell whose chromosome number is an integral multiple of the normal haploid number characteristic of the species. Euploids may be as diploid, triploid, tetraploid, or polyploid. 2. adj, pertaining to such an individual, organism, strain, or cell. Compare aneuploid. −euploidy, n.