Pronunciation IPA (key): /klæn/ Audio (US)(file) Noun Singular clan Plural clans (countable) A clan is an extended group of families, with a real or mythical founding member. Everyone in the clan knew the story of Dasi and Leben. Dromoland was built in the 1600s as the base of the O'Brien clan. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads