-ploid \ˌplȯid\adjective combining form Etymology: International Scientific Vocabulary, from diploid (II) & haploid (I) : having or being a chromosome number that bears (such) a relationship to or is (so many) times the basic chromosome number characteristic of a given plant or animal group < heteroploid > < hexaploid > < heptaploid > < crossing 12-, 9-, and 8-ploid western blackberries — Biological Abstracts >