n. The condition of being aneuploid; the state of possessing chromosome number that is not an exact multiple of the haploid number.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete)
Word Usage
"In an average, healthy man, one to four percent of his sperm has aneuploidy, that is, sperm that has more or less of the usual number of 23 chromosomes."