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sumac (n.)

also sumach, c. 1300, "preparation of dried, chopped leaves of a plant of the genus Rhus" (used in tanning and dyeing and as an astringent), from Old French sumac (13c.), from Medieval Latin sumach, from Arabic summaq, from Syrian summaq "red." Of the tree itself from 1540s; later applied to a North American plant species.

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Definitions of sumac from WordNet

sumac (n.)
wood of a sumac;
sumac (n.)
a shrub or tree of the genus Rhus (usually limited to the non-poisonous members of the genus);
Synonyms: sumach / shumac
From wordnet.princeton.edu