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A compound formerly supposed to be modification of oxygen, but now known to be hydrogen dioxide; -- so called because apparently antagonistic to ozone, converting it into ordinary oxygen.

Pertaining to Aonia, Boeotia, or to the Muses, who were supposed to dwell there. Aonian fount, the fountain of Aganippe, at the foot of Mount Helicon, not far from Thebes, and sacred to the Muses.

The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

Either entirely of partially separate, as the carpels of a compound pistil; -- opposed to syncarpous. Lindley.

A group of corals in which the coral is not porous; -- opposed to Perforata.

One of a sect of ancient Christians, who, in supposed imitation of the first believers, renounced all their possessions.

Appearing to the eye or mind (distinguished from, but not necessarily opposed to, true or real); seeming; as the apparent motion or diameter of the sun. To live on terms of civility, and even of apparent friendship. Macaulay. What Berkeley calls visible magnitude was by astronomers called apparent magnitude. Reid. Appa…

irst appearance of a star or other luminary after having been invisible or obscured; -- opposed to occultation. Circle of perpetual apparition. See under Circle.

lant jurisdiction." Hallam. Party appellant (Law), the party who appeals; appellant; -- opposed to respondent, or appellee. Tomlins.

Common, as opposed to proper; denominative of a class.

The defendant in an appeal; -- opposed to appellant.

Any fruit or other vegetable production resembling, or supposed to resemble, the apple; as, apple of love, or love apple (a tomato), balsam apple, egg apple, oak apple.

Capable of being apposed, or applied one to another, as the thumb to the fingers of the hand.

To raise the value of; to increase the market price of; -- opposed to depreciate. [U.S.] Lest a sudden peace should appreciate the money. Ramsay.

A rise in value; -- opposed to depreciation.

etc. The April's her eyes; it is love's spring. Shak. April fool, one who is sportively imposed upon by others on the first day of April.

Inclined; disposed customarily; given; ready; -- used of persons. Apter to give than thou wit be to ask. Beau. & Fl. That lofty pity with which prosperous folk are apt to remember their grandfathers. F. Harrison.

e no series of columns along their sides, but are either prostyle or amphiprostyle, and opposed to peripteral. R. Cyc.

Destitute of winglike membranous expansions, as a stem or petiole; -- opposed to atate.

.) -- Aqueous rocks (Geol.), those which are deposited from water and lie in strata, as opposed to volcanic rocks, which are of igneous origin; -- called also sedimentary rocks.