sac : Idioms & Phrases

Index

air sac

  • noun a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
    air cell; alveolus.
  • noun any of the thin-walled extensions of the tracheae of insects
  • noun any of the membranous air-filled extensions of the lungs of birds
WordNet
Air" sac`
Definitions
  1. (Anat.) One of the spaces in different parts. of the bodies of birds, which are filled with air and connected with the air passages of the lungs; an air cell.
Webster 1913

amniotic sac

  • noun thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
    amnion; amnios.
WordNet

Ampullaceous sac

  • (Zoöl.), one of the peculiar cavities in the tissues of sponges, containing the zooidal cells.
Webster 1913

cul de sac

  • noun a passage with access only at one end
    dead end; cul.
  • noun a street with only one way in or out
    blind alley; impasse; dead-end street.
WordNet

cul-de-sac

Cul`-de-sac" noun
Etymology
F., lit., bottom of a bag.
Wordforms
plural Culs-de-sac
Definitions
  1. A passage with only one outlet, as a street closed at one end; a blind alley; hence, a trap.
  2. (Mil.) a position in which an army finds itself with no way of exit but to the front.
  3. (Anat.) Any bag-shaped or tubular cavity, vessel, or organ, open only at one end.
Webster 1913

Dart sac

  • (Zoöl.), a sac connected with the reproductive organs of land snails, which contains a dart, or arrowlike structure.
Webster 1913

embryo sac

Em"bry*o sac`
Definitions
  1. (Bot.) See under Embryonic.
Webster 1913

Embryonic sac ∨ vesicle

  • (Bot.), the vesicle within which the embryo is developed in the ovule; sometimes called also amnios sac, and embryonal sac.
Webster 1913

greater peritoneal sac

  • noun the interior of the peritoneum; a potential space between layers of the peritoneum
    peritoneal cavity.
WordNet

Ink sac

  • (Zoöl.), an organ, found in most cephalopods, containing an inky fluid which can be ejected from a duct opening at the base of the siphon. The fluid serves to cloud the water, and enable these animals to escape from their enemies. See Illust. of Dibranchiata.
Webster 1913

lacrimal sac

  • noun 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
    lacrimal sac; dacryocyst.
WordNet

Lung sac

  • (Zoöl.), one of the breathing organs of spiders and snails.
Webster 1913

pericardial sac

  • noun the membrane surrounding the heart
WordNet

Poison sac

  • . (Zoöl.) Same as Poison gland, above. See Illust. under Fang.
Webster 1913

Pollen sac

  • a compartment of an anther containing pollen, usually there are four in each anther.
Webster 1913

sac fungus

  • noun any of various ascomycetous fungi in which the spores are formed in a sac or ascus
WordNet

Soc and sac

  • (O. Eng. Law), the full right of administering justice in a manor or lordship.
Webster 1913

spore sac

  • noun organ containing or producing spores
    spore case; sporangium.
WordNet

tear sac

  • noun 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
    lacrimal sac; dacryocyst.
WordNet

vitelline sac

  • noun membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
    vesicula umbilicus; vitelline sac; umbilical vesicle.
WordNet

yolk sac

  • noun membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
    vesicula umbilicus; vitelline sac; umbilical vesicle.
  • noun membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
WordNet