isochromosome

[ī′sə-krōmə-sōm′]

n.

A chromosomal aberration in which two daughter chromosomes are formed, each lacking one chromosome arm but with the other arm doubled.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.