Home › Words › S › suppressantsuppressant/səˈpɹɛs.ənt/suppressant · noun — A substance that suppresses.Definition from Wiktionary (CC BY-SA 3.0).suppressant is pronounced /səˈpɹɛs.ənt/.EtymologyFrom suppress + -ant.nounA substance that suppresses.Definitions & examples from Wiktionary (CC BY-SA 3.0).