: a chromosome other than a sex chromosome

Examples of autosome in a Sentence

Recent Examples on the Web
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Remember this is the ratio of the diversity of Z, the analog to the X, with the autosome. Razib Khan, Discover Magazine, 16 Sep. 2012 Law enforcement also tested 20 or so genetic markers from autosomes—nonsex chromosomes, which are inherited from both parents. Allysia Finley, WSJ, 15 Feb. 2019 The concentration levels of autosomes in the human cell tend to be much lower than those of the mitochondria, and so Li and Austin were able to obtain only 50,000 SNPs, of which 16,000 were usable. IEEE Spectrum, 20 Mar. 2023

Word History

Etymology

auto- + -some entry 3

Note: The term was introduced by the American zoologist Thomas Harrington Montgomery, Jr. (1873-1912) in "The terminology of aberrant chromosomes and their behavior in certain Hemiptera," Science, new series vol. 33, no. 575 (January 5, 1906), pp. 36-38.

First Known Use

1906, in the meaning defined above

Time Traveler
The first known use of autosome was in 1906

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Cite this Entry

“Autosome.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/autosome. Accessed 7 Jul. 2026.

Medical Definition

autosome

noun
: a chromosome other than a sex chromosome

called also nonsex chromosome

compare allosome

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