This term denotes pulverized limestone or chalk, appearing in Isaiah's prophecy about altar stones crushed like chalk. The word may be an Aramaic loanword, as the cognates appear across Aramaic dialects. Isaiah uses the image of chalk-stones—soft, easily crushed—to describe the total destruction of idolatrous altars. When limestone is pulverized into powder, it cannot be reconstructed; the prophet envisions pagan worship sites reduced to dust, never to be rebuilt.