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A group of Turbellaria in which there is no anal aperture.

Of or pertaining to the apsides of an orbit.

Ready; especially fitted or qualified (to do something); quick to learn; prompt; expert; as, a pupil apt to learn; an apt scholar. "An apt wit." Johnson. Live a thousand years, I shall not find myself so apt to die. Shak. I find thee apt . . . Now, Hamlet, hear. Shak.

In an apt or suitable manner; fitly; properly; pertinently; appropriately; readily.

Pertaining to, or characterized by, aptotes; uninflected; as, aptotic languages.

Incombustible; capable of sustaining a strong heat without alteration of form or properties.

Of or pertaining to an aquarium.

Pertaining to water growing in water; living in, swimming in, or frequenting the margins of waters; as, aquatic plants and fowls.

Of or pertaining to Aquitania, now called Gascony.

Of or pertaining to Arabia or its inhabitants. Arabian bird, the phenix. Shak.

Of or pertaining to Arabia or the Arabians. Arabic numerals or figures, the nine digits, 1, 2, 3, etc., and the cipher 0. -- Gum arabic. See under Gum.

Of or pertaining to Aracan, a province of British Burmah. -- n. sing. & pl.

Of or pertaining to an order of plants, of which the genus Arum is the type.

Of or pertaining to the Arachnida.

Pertaining to a thin membrane of the brain and spinal cord, between the dura mater and pia mater.

Pertaining to the arachnoid membrane; arachnoid.

Of or pertaining to arachnology.

Of or pertaining to Aragon, in Spain, or to its inhabitants. -- n. sing. & pl.

Of or pertaining to the Syrians and Chaldeans, or to their language; Aramaic. -- n.

Pertaining to Aram, or to the territory, inhabitants, language, or literature of Syria and Mesopotamia; Aramæan; -- specifically applied to the northern branch of the Semitic family of languages, including Syriac and Chaldee. -- n.