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Having a chromosome number that is not a whole-number multiple of the haploid chromosome number of a given species.

het′er·o·ploid′ n.
het′er·o·ploi′dy n.


(Genetics) the condition of having an abnormal number of chromosomes
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Noun1.heteroploidy - the condition of being heteroploid
condition - a mode of being or form of existence of a person or thing; "the human condition"
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The bulk of heteroploidy is constituted of hypoploid cells; apparently this is due to the action of the hypnotizing solution on arrangement of chromosomes in metaphase cells.
The age dynamics of levels heteroploidy of the cattle Alatau breeds.