sac /ˈsæk/
 囊;液囊;氣囊
 Sac n. Ethnol. See Sacs.
 Sac, n.  O.Eng. Law The privilege formerly enjoyed by the lord of a manor, of holding courts, trying causes, and imposing fines.
 Sac n.
 1. See 2d Sack.
 2. Biol. A cavity, bag, or receptacle, usually containing fluid, and either closed, or opening into another cavity to the exterior; a sack.
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 sac
      n 1: an enclosed space; "the trapped miners found a pocket of
           air" [syn: pouch, sack, pocket]
      2: a case or sheath especially a pollen sac or moss capsule
         [syn: theca]
      3: a member of the Algonquian people formerly living in
         Wisconsin in the Fox River valley and on the shores of
         Green Bay [syn: Sauk]
      4: a structure resembling a bag in an animal