Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.
  • n. See alveolus.
  • n. A saclike, thin-walled enlargement in the trachea of an insect.

from the GNU version of the Collaborative International Dictionary of English

  • 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.
  • An alveolus.

from The Century Dictionary and Cyclopedia

  • n. In ornithology, a large air-cell; an air-space, an air-receptacle, or a pneumatocyst; one of the membranous bags or receptacles of air lodged in the hollow bones and the cavities of the body of birds, and communicating with the lungs.
  • n. plural The elongated cavities forming the ultimate branches of the air-passages in the lungs of mammals. Also called infundibula.
  • n. In botany, a cavity in a pollen-grain of the genus Pinus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
  • n. any of the thin-walled extensions of the tracheae of insects
  • n. any of the membranous air-filled extensions of the lungs of birds

Etymologies

Sorry, no etymologies found.

Examples

Sorry, no example sentences found.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.