- of a chromosome number that is neither the haploid nor diploid number characteristic of the species
- such a chromosome number
- Having a chromosome number that is not a whole-number multiple of the haploid chromosome number for that species.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.