asthmatic asth·ma·tic UK/æsˈθmætɪk/ US/æsˈmætɪk/ uncommon adjective 1. relating to breathing with a whistling sound Synonymswheezingwheezy Similarunhealthy WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.