orthopteroid Syllabification: (or·thop·ter·oid)Pronunciation: /ôrˈTHäptəˌroid/Definition of orthopteroid adjective Entomology of or relating to a group of insect orders that are related to the grasshoppers and crickets, including also the stoneflies, stick insects, earwigs, cockroaches, mantises, and termites. orthopteroid in other Oxford dictionaries Definition of orthopteroid in the British & World English dictionary