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See Pneumothorax.

n in which air or other gas is present in the cavity of the chest; -- called also pneumatothorax.

See Portass. [Obs.] Chaucer.

Of or pertaining to the prothorax.

The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

Accumulation of air, or other gas, and of pus, in the pleural cavity.

A radioactive substance apparently formed as a product from thorium.

A rhetorician; a careful writer. [Obs.] If a rethor couthe fair endite. Chaucer.

Rhetoric. [Obs.] Chaucer.

One of a breed of large, heavy domestic cattle having short horns. The breed was developed in England.

An orthoceras.

To disown the authority of; to repudiate.

The hawthorn.

A thorny European shrub (Hippophaë rhamnoides) resembling a willow.

A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff.

A genus of shrubby ranunculaceous plants of North America, including only the species Xanthorhiza apiifolia, which has roots of a deep yellow color; yellowroot. The bark is intensely bitter, and is sometimes used as a tonic.

A genus of endogenous plants, native to Australia, having a thick, sometimes arborescent, stem, and long grasslike leaves. See Grass tree.

A female superior or governess of a nunnery, or convent of nuns, having the same authority over the nuns which the abbots have over the monks. See Abbey.

To renounce; to relinquish; -- said of authority, a trust, duty, right, etc. He abdicates all right to be his own governor. Burke. The understanding abdicates its functions. Froude.

ntary renunciation of sovereign power; as, abdication of the throne, government, power, authority.