trifoliatePronunciation: /trʌɪˈfəʊlɪət/Definition of trifoliate adjective (of a compound leaf) having three leaflets:dark green trifoliate leaves (of a plant) having trifoliate leaves: the trifoliate orange appreciates an acidic soil (of an object or design) having the form of a trifoliate leaf:a bronze trifoliate key handletrifoliate in other Oxford dictionaries Definition of trifoliate in the US English dictionary