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Definition of Aneuploidy
1. Noun. An abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete).
Definition of Aneuploidy
1. [n -DIES]
Medical Definition of Aneuploidy
1. One or a few chromosomes above or below the normal chromosome number. For example, three number 21 chromosomes or trisomy 21 (characteristic of Down syndrome) is a form of aneuploidy. (12 Dec 1998)