Definition of "autosome"

Autosoma (or autosome), the usual or non-aberrant chromosomes, called by me previously ordinary chromosomes.

1906 January 5, Thos. H. Montgomery, “The terminology of aberrant chromosomes and their behavivor in certain Hemiptera”, in Science, volume 23, number 575, page 36

It is apparently formed by the arms of the loops becoming twisted around each other, and, as in the Acrididae, each of these arms no doubt represents a univalent autosome.

1908, Herbert Spencer Davis, Spermatogenesis in Acrididae and Locustidae