Entry 1 sense Webster, 1913 Bristletail · Bris·tle·tail · IPA /ˈbɹɪsəlˌteɪl/ 01 n. An insect of the genera Lepisma, Campodea, etc., belonging to the Thysanura. 1. An insect of the genera Lepisma, Campodea, etc., belonging to the Thysanura.(Zool.)