Noun
any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa
Source: WordNetThe autosome pairs are labeled with numbers (1-22 in humans) roughly in order of their sizes in base pairs, while allosomes are labelled with their letters. Source: Internet
Having three copies of an autosome (known as a trisomy) is far more compatible with life, however. Source: Internet