Entry 1 sense Webster, 1913 Trifoliate /trīfōʹlĭət/ · Tri·fo·li·ate · IPA /tɹaɪˈfəʊlɪət/ 01 a. Having three leaves or leaflets, as clover. See Illust. of Shamrock. 1. Having three leaves or leaflets, as clover. See Illust. of Shamrock.(Bot.) See: Shamrock