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Having a chromosome number that is not a multiple of the haploid number for the species.
A cell or an organism characterized by an aneuploid chromosome number.

an′eu·ploi′dy (-ploi′dē) n.
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Noun1.aneuploidy - an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete)
abnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies
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References in periodicals archive ?
Duesberg says that these patterns may reflect essential chromosome changes needed to create a viable aneuploid cell from the original normal tissue.
The c-erbB-2 oncogene amplification by competitive PCR in aneuploid cell clones flow sorted from breast cancer samples.
Because HepG2 is an aneuploid cell line (modal number = 55 chromosomes; range = 50-60 chromosomes), we calculated SCE per chromosome.
Samples that lacked dysplasia displayed mixed diploid, and mild to moderately aneuploid cell populations in 5% of cases, which were more numerous in cases of dysplasia (60%) and adenocarcinoma (88%).