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autosome (n.)

"an ordinary (non-sex) chromosome," 1906, coined by U.S. cytologist T.H. Montgomery from auto- + -some (3)). Related: Autosomal.

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Definitions of autosome from WordNet

autosome (n.)
any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa;
Synonyms: somatic chromosome
From wordnet.princeton.edu