blattoid /ˈblæ.tɔɪd/adjective 1noun 1forms 3 adjective1 •Relating to the Blattoidea, comprised of cockroaches and termites. noun1 •Any member of the Blattoidea superfamily of cockroaches and termites.This result, however, is much younger than some “roachoid” fossils and clearly invalidates the hypothesis suggesting that winged “blattoids” would date back to the Devonian. — 2015 formsblattoids · more blattoid · most blattoid