1. To convert, as any animal or vegetable matter, into stone or stony substance. A river that petrifies any sort of wood or leaves. Kirwan. 2. To make callous or obdurate; to stupefy; to paralyze; to transform; as by petrifaction; as, to petrify the heart. Young. "Petrifying accuracy." Sir W. Scott. And petrify a genius to a dunce. Pope. The poor...