Lewis & Short

trĭfer, fĕra, fĕrum, adj. [ter-fero], thricebearing, that bears fruit three times a year: ficus, Col. 5, 10, 11; cf.: ficus trifero proventu, Plin. 15, 18, 19, § 71: vites, id. 16, 27, 50, § 114.