noun Genetics.
any chromosome other than a sex chromosome.
Also called euchromosome.

1905–10; auto-1 + -some3

autosomal, adjective
autosomally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autosome (ˈɔːtəˌsəʊm)
any chromosome that is not a sex chromosome

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

coined 1906 by U.S. cytologist T.H. Montgomery (1873-1912), from auto- + Gk. soma "body." Related: Autosomal (1930).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

autosome au·to·some (ô'tə-sōm')
A chromosome other than a sex chromosome, normally occurring in pairs in somatic cells and singly in gametes.

au'to·so'mal (-sō'məl) adj.
au'to·so'mal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It may be inherited as an autosomal dominant or autosomal recessive trait.
The disease is an autosomal recessive genetic disorder.
In autosomal dominant nocturnal frontal lobe epilepsy, a rare inherited form,
  seizures often occur during sleep.
Multiple lentigines syndrome is inherited as an autosomal dominant trait.
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