Word parts fire + arm Pronunciation (US) IPA (key): /ˈfaɪ.ərɑrm/ (UK) IPA (key): /ˈfaɪ.əɑːm/ Audio (US)(file) Noun Singular firearm Plural firearms (countable) A firearm is a gun. Synonym: gun Soldiers used the firearms to shot the other side. Related words fire arm Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads