co·​dom·​i·​nant ˌkō-ˈdä-mə-nənt How to pronounce codominant (audio)
: forming part of the main canopy of a forest
codominant trees
: sharing in the controlling influence of a biotic community
: being fully expressed in the heterozygous condition
codominant alleles
codominant noun

Examples of codominant in a Sentence

Recent Examples on the Web Just one of the three stems that split off is the size of a large tree, said Doran, who said the redwood had three codominant trunks that formed when the plant was young. Annie Vainshtein, San Francisco Chronicle, 27 Mar. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'codominant.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1882, in the meaning defined at sense 1a

Time Traveler
The first known use of codominant was in 1882

Dictionary Entries Near codominant

Cite this Entry

“Codominant.” Dictionary, Merriam-Webster, Accessed 29 Nov. 2023.

Medical Definition


co·​dom·​i·​nant (ˈ)kō-ˈdäm-ə-nənt How to pronounce codominant (audio)
: being fully expressed in the heterozygous condition
the alleles controlling blood groups A and B are codominant since an individual with both alleles belongs to blood group AB
codominant noun
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