Definitions from Wiktionary (sumac)

▸ noun:  Any of various shrubs or small trees of the genus Rhus and other genera in Anacardiaceae
▸ noun:  particularly, one of species Rhus coriaria (tanner's sumac)
▸ noun:  Dried and chopped-up leaves and stems of a plant of the genus Rhus, particularly tanner's sumac (see sense 1), used for dyeing and tanning leather or for medicinal purposes.
▸ noun:  A sour spice popular in the Eastern Mediterranean, made from the berries of tanner's sumac.
▸ verb:  (transitive) To apply a preparation of sumac to (an object), for example, to a piece of leather to tan it.
▸ noun:  Alternative form of soumak [A flatweave technique for making sturdy, decorative fabrics used for carpets, bags, bedding, etc.]

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