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rinciple, whose presence is necessary to produce acidity, as oxygen, chlorine, bromine, iodine, etc.

A genus of ganoid fishes, including the sturgeons, having the body armed with bony scales, and the mouth on the under side of the head. See Sturgeon.

An isolated point not upon a curve, but whose coördinates satisfy the equation of the curve so that it is considered as belonging to the curve.

The lowest group of Vertebrata, including the amphioxus, in which no skull exists.

A group of acalephs, including most of the larger jellyfishes; the Discophora.

A plant of the highest class of cryptograms, including the ferns, etc. See Cryptogamia. The Age of Acrogens (Geol.), the age of coal plants, or the carboniferous era.

Having each verse begin with the same letter as that with which the preceding verse ends.

th. (Ch. Hist.) See Auto-da-Fé. -- Act of God (Law), an inevitable accident; such extraordinary interruption of the usual course of events as is not to be looked for in advance, and against which ordinary prudence could not guard. -- Act of grace, an expression often used to designate an act declaring pardon or amnes…

A large division of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not.

An instrument for measuring and recording the variations in the actinic or chemical force of rays of light. Nichol.

er real or imaginary, forming the subject of a play, poem, or other composition; the unfolding of the drama of events.

In action; actually proceeding; working; in force; -- opposed to quiescent, dormant, or extinct; as, active laws; active hostilities; an active volcano.

Sharp at the end; ending in a sharp point; pointed; -- opposed to blunt or obtuse; as, an acute angle; an acute leaf.

on; acumen; keenness; sharpness; sensitiveness; -- applied to the senses, or the understanding. By acuteness of feeling, we perceive small objects or slight impressions: by acuteness of intellect, we discern nice distinctions. Perhaps, also, he felt his professional acuteness interested in bringing it to a successful c…

"Original sin;" human frailty. And whipped the offending Adam out of him. Shak. Adam's ale, water. [Coll.] -- Adam's apple.

ustralia. Both have a trunk of moderate height, but of enormous diameter, and a wide-spreading head. The fruit is oblong, and filled with pleasantly acid pulp. The wood is very soft, and the bark is used by the natives for making ropes and cloth. D. C. Eaton.

Suited, given, or tending, to adaptation; characterized by adaptation; capable of adapting. Coleridge. -- A*dapt"ive*ly, adv.

By day, or every day; in the daytime. [Obs.] Fielding.

One who, or that which, adds; esp., a machine for adding numbers.

To adapt; to make suitable; to fit. [Obs.] The land about is exceedingly addicted to wood, but the coldness of the place hinders the growth. Evelyn.