Entry 6 senses · 3 variants Webster, 1913 Cleft /(klĕft)/ · IPA /klɛft/ imp. & p. p. a. n. 01 imp. & p. p. imp. & p. p. from Cleave. 1. imp. & p. p. from Cleave. See: Cleave 02 a. Divided; split; partly divided or split. 1. Divided; split; partly divided or split. 2. Incised nearly to the midrib; as, a cleft leaf.(Bot.) 03 n. A space or opening made by splitting; a crack; a crevice; as, the cleft of a rock. 1. A space or opening made by splitting; a crack; a crevice; as, the cleft of a rock. 2. A piece made by splitting; as, a cleft of wood. 3. A disease in horses; a crack on the band of the pastern.(Far.) Phrases & compounds Branchial clefts — See under Branchial. Syn. Crack; crevice; fissure; chink; cranny.