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Noun sac has 4 senses
  1. pouch, sac, sack, pocket - an enclosed space; "the trapped miners found a pocket of air"
    --1 is a kind of cavity, enclosed space
  2. theca, sac - a case or sheath especially a pollen sac or moss capsule
    --2 is a kind of covering, natural covering, cover
  3. Sauk, Sac - a member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay
    --3 is a kind of Algonquian, Algonquin
    --3 has particulars: Black Hawk, Makataimeshekiakiak; Keokuk
  4. sac - a structure resembling a bag in an animal
    --4 is a kind of
    cavity, bodily cavity, cavum
    --4 has particulars:
     yolk sac; yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus; amnion, amniotic sac, amnios; chorion; coelenteron; air bladder, swim bladder; air sac; air sac; saccule, sacculus; bladder, vesica; acinus; bursa; cisterna, cistern; pouch, pocket; vesicle, cyst; alveolus, air sac, air cell; pericardial sac
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