कालकूट kālakūṭ, vulg. kālkūṭ(fr. kalakūṭa), s.m. A kind of poison contained in a bulbous root or tuber; a deadly poison; a poison produced at the churning of the ocean (swallowed by Śiva, and causing the blueness of his throat);—poison, venom; rancour, spite, malice.
