Sac (săk), n. [F., fr. L. saccus a sack. See Sack a bag.] 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.