Noun
The true, or six-legged, insects; insects other than myriapods and arachnids.
Source: Webster's dictionaryThis classification divided arthropods into a three-phyla polyphyletic group, with phylum Uniramia including the Hexapoda (insects), Myriapoda (centipedes and millipedes) and the Onychophora (velvetworms). Source: Internet