- of, relating to, or designating a basically diploid chromosome complement, in which some but not all the chromosomes are represented more than twice
C20: from poly- + -some ³ + -ic
- Having an extra copy of one or more chromosomes.
- A polysomic organism or cell.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.