• An Irish boat, constructed like a coracle, and originally the same shape; now a boat of similar construction but conventional shape and large enough to be operated by up to eight oars.
• 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.
• a Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tract; voluntarily withdrawn from the market in 2004
• a terrorist organization founded by Osama bin Laden in the 1980s to provide money and recruit fighters around the world; enlisted and transported thousands of men to Afghanistan to fight the Russians; a split in the group led bin Laden and the extremist faction of MAK to form al-Qaeda
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