alum (hal-), n., or alus, i, f., a plant.
I Comfrey : Symphytum officinale, Linn.; Plin. 27, 6, 24, § 41; 26, 7, 26, § 42; App. Herb. 59.—
II A kind of garlic , Plin. 19, 6, 34, § 116.
·vt To steep in, or otherwise impregnate with, a solution of alum; to treat with alum. II. Alum ·no...
Webster's Dictionary of the English Language