# overdominance

> English word · Noun

## Definitions
1. The case in which a heterozygote has a higher fitness or more extreme phenotype than either homozygote.
2. Excessive dominance.

## Etymology
From over- + dominance.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/overdominance