dysgenics dys·ge·nics UK/dɪsˈdʒɛnɪks/ uncommon noun 1. the study of the operation of factors causing degeneration in the type of offspring produced Synonymscacogenics Antonymseugenics Related words Broader terms life science WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved.