• noun
• synonym
• antonym

• noun
• synonym
• antonym

• air sac (noun)
  1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
  2. any of the thin-walled extensions of the tracheae of insects
• amniotic sac (noun)
  1. reptiles, birds and mammals thin innermost membranous sac enclosing the developing embryo of higher vertebrates
• cul de sac (noun)
  1. a passage with access only at one end
  2. a street with only one way in or out
• cul-de-sac (noun)
  1. a road which is closed at one end, so that there is only one way in and out
  2. an unhelpful situation in which you cannot make any more progress
• greater peritoneal sac (noun)
  1. the interior of the peritoneum; a potential space between layers of the peritoneum
• lacrimal sac (noun)
  1. either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands
• pericardial sac (noun)
  1. the membrane surrounding the heart
• sac fungus (noun)
  1. any of various ascomycetous fungi in which the spores are formed in a sac or ascus
• spore sac (noun)
  1. organ containing or producing spores
• tear sac (noun)
  1. either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands
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