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Definition of sac : 1. A cavity, bag, or receptacle, usually containing fluid, and either closed, or opening into another cavity to the exterior; a sack.
2. See 2d Sack.
3. See Sacs.
4. The privilege formerly enjoyed by the lord of a manor, of holding courts, trying causes, and imposing fines.

Synonyms:

release, pocket, scoop, anatomical, paper bag, dismissal, sack, firing, dismission, bony, sackful, poke, chemise, anatomy, capsule, carapace, sacking, theca, air hole, sacque, air pocket, arm, antler, belly, blowhole, shift, body, hammock, cyst, cellblister, discharge, liberation, pouch, sore, carrier bag

Usage examples:

• Tongue cordiform, shallowly notched behind and only slightly free posteriorly; vomerine teeth 0- 3, situated on rounded elevations between somewhat larger, round inner nares; openings to vocal sac large, one situated along posterior margin of each mandibular ramus. - "A Review of the Middle American Tree Frogs of the Genus Ptychohyla", William E. Duellman.
• And Marsac, if I remember rightly, is not far from Rennes, on the Vilaine? - "Historical Romances: Under the Red Robe, Count Hannibal, A Gentleman of France", Stanley J. Weyman.
• Now, if we lift the margin of the rent, we shall see that the veil and the cake together form a sac which we are holding by the opening. - "The Prospective Mother A Handbook for Women During Pregnancy", J. Morris Slemons.