aneuploid

https://doi.org/10.1351/goldbook.10393

Referring to a cell or organism with missing or extra chromosomes or parts of chromosomes, and thus an abnormal number of chromosomes that is not an exact multiple of the haploid number.

See also: euploid
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 723 [Terms] [Paper]