1) Abnormal condition 2) Abnormalcy 3) Abnormality 
Chromosome constitution differing from the usual diploid constitution by loss or duplication of chromosomes or chromosomal segments. 
Cell or organism with missing or extra chromosomes or parts of chromosomes and thus an abnormal number of chromosomes which is not an exact multiple of the haploid number.
<biology> The characteristic of having a chromosome complement that is not an exact multiple of the haploid number, with either fewer or more than the normal number of chromosomes in the cell. Chromosomes may be present in multiple copies (e.g. Trisomy) or one of a homologous pair may be missing in a diploid cell. This is an abnormal cell. â...
Having a chromosome complement that is not an exact multiple of the haploid number. Chromosomes may be present in multiple copies (eg. trisomy) or one of a homologous pair may be missing in a diploid cell.
Type: Term Pronunciation: an′yū-ployd Definitions: 1. Having an abnormal number of chromosomes not an exact multiple of the haploid number, as contrasted with abnormal numbers of complete haploid sets of chromosomes, such as diploid or triploid, etc.
[adj] - having a chromosome number that is not an exact multiple of the haploid number
aneuploid A reference to, or descriptive of, the condition of having an abnormal number of chromosomes for the species indicated.
adjective having a chromosome number that is not an exact multiple of the haploid number