- The condition in which a heterozygote has a phenotype that is more pronounced or better adapted than that of either homozygote.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for overdominance
Historical Examples of overdominance
According to statistical studies, overdominance by parents decreases the chance of successful marriage.