medicinal drug me·di·ci·naldrug uncommon noun 1. (medicine) something that treats or prevents or alleviates the symptoms of disease Synonymsmedicinemedicationmedicamentmedicinal drug Related words Word family medicatemedicine Broader terms drug Narrower terms acycloviralendronateallopurinolamrinoneanalgesicangiogenesis inhibitorantiarrhythmicantibacterial Part of physostigmine WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.