THORN

n. Tho2rn. A spine; also the genus Cratcegus and other spiny plants, [a, 35.] Leaf t. A leaf which is contracted into a spine or a petiole which is hardened into a spine after the fall of the blade of the leaf, [a, 35.] Purging t., Rhine berry t. See RHAMNUS cathartic us. [s. 620]