Any of various shrubs or small trees of the genus Rhus and other genera in Anacardiaceae, particularly the elm-leaved sumac, Sicilian sumac, or tanner's sumac (Rhus coriaria).
Dried and chopped-up leaves and stems of a plant of the genus Rhus, particularly the tanner's sumac (see sense 1), used for dyeing and tanning leather or for medicinal purposes.
A sour spice popular in the Eastern Mediterranean, made from the berries of tanner's sumac.
To apply a preparation of sumac to (an object), for example, to a piece of leather to tan it.
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