s. 1. (pl. ثلل , sülel) The amount of earth excavated while digging a well; also, the amount of mud excavated in cleaning out a well; also, the space of ground covered with its excavated earth or mud; if the well be dug in an unappropriated spot, this space becomes the property of him who digs the well. 2. A grave, refilled with the earth dug from it. 3. A column of earth or clay, raised for shade in the desert. 4. (pl. ثلل ثلال) A flock of sheep or goats, or of sheep and goats. 5. Wool; or wool and goats’ or camels’ hair mixed. 6. Hair on a man’s body. 7. A notch, gap, chink.