any of an order (Thysanura) of very primitive insects that have bristlelike appendages at the rear end, including bristletails and silverfish
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.