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air sac an air-filled space or cavity in a living organism, esp. any of the ends of certain bronchial tubes in a bird's body that connect with the larger body cavity and assist in breathing.
cul-de-sac a passage whose only exit is the entrance, such as a dead-end street. [2 definitions]
egg sac the pouch or cocoon in which many types of spiders deposit their eggs. [2 definitions]
yolk sac a membranous sac that nourishes the embryos of primitive mammals, bony fishes, sharks, reptiles, and birds. [2 definitions]