Added 10 October 2026 redbug noun Categories: AnimalsObscure Words noun ! Definition from WordNet 3.1, Princeton University. More about redbug at Wordnik → Where our words come from → Larval mite that sucks the blood of vertebrates including human beings causing intense irritation. Origin From red + bug. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: chiggerjiggerfirebugreduviidreduvidlovebug Back to today's word