from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A small angular cavity or pit, such as a honeycomb cell.
- n. A tooth socket in the jawbone.
- n. A tiny, thin-walled, capillary-rich sac in the lungs where the exchange of oxygen and carbon dioxide takes place. Also called air sac.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A small cavity or pit.
- n. an anatomical structure that has the form of a hollow cavity
- n. a small air sac in the lungs, where oxygen and carbon dioxide are exchanged with the blood.
from the GNU version of the Collaborative International Dictionary of English
- n. A cell in a honeycomb.
- n. A small cavity in a coral, shell, or fossil.
- n. A small depression, sac, or vesicle, as the socket of a tooth, the air cells of the lungs, the ultimate saccules of glands, etc.
from The Century Dictionary and Cyclopedia
- n. In general, any little cell, pit, cavity, fossa, or socket, as one of the cells of a honeycomb, etc. Also called alveole.
- n. Specifically, in zoology: The socket of a tooth; the pit in a jaw-bone in which a tooth is inserted.
- n. An air-cell; one of the compartments, about one hundredth of an inch in diameter, which line the infundibula and alveolar passages of the lungs.
- n. One of the pits or compartments in the mucous membrane of the second stomach of a ruminant; a cell of ”honeycomb” tripe. See cut under ruminant.
- n. A certain vacant space in the sarcode of a radiolarian, either within or without the capsule. Pascoe.
- n. A cell or pit in certain fossils, as in an alveolite.
- n. One of the ultimate follicles of a racemose gland. See acinus, 2 .
- n. One of the five hollow cuneate calcareous dentigerous pieces which enter into the composition of the complex dentary apparatus or oral skeleton of a sea-urchin. See lantern of Aristotle (under lantern), and cuts under clypeastrid and Echinoidea.
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. a bony socket in the alveolar ridge that holds a tooth
Latin, small hollow, diminutive of alveus, a hollow, from alvus, belly.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin alveolus, a diminutive of alveus ("a tray, trough, basin"), from alvus ("the belly, the stomach, bowels, womb, etc."). (Wiktionary)