Pronunciation (UK) IPA (key): /fɜː(r)/, SAMPA: /f3:(r)/ (US) IPA (key): /fɝː/ Audio (UK)(file) Audio (US)(file) Homophone: fur Noun Singular fir Plural firs (countable) A kind of tree that keeps its leaves all year. My Christmas tree is a fir tree. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads