CleftCLEFT, participle passive of cleave. Divided; split; parted asunder.CLEFT, noun1. A space or opening made by splitting; a crack; a crevice; as the cleft of a rock. [[Isaiah 2#21|Isaiah 2:21]].2. A disease in horses; a crack on the bought of the pastern.3. A piece made by splitting; as a cleft of wood.