Part of speech: noun

Biol. A membranous pouch; a cavity; receptacle.

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Usage examples "sac":

  1. When you get up to the picture, you find the cul de sac is an illusion. - "Story of My Life, volumes 1-3", Augustus J. C. Hare.
  2. But when he had to, he could contract those muscles around the oil sac with such violence that the deadly oil- blinding and suffocating- would be shot forth to a distance of several feet, right into the face of the enemy. - "Children of the Wild", Charles G. D. Roberts.
  3. By about the sixth week after delivery, the wound which was made by the separation of the fetal sac has completely healed. - "The Prospective Mother A Handbook for Women During Pregnancy", J. Morris Slemons.