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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.

as or for, to do the work of; to serve as. -- To act on, to regulate one's conduct according to. -- To act up to, to equal in action; to fulfill in practice; as, he has acted up to his engagement or his advantages.

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.

The act of adding two or more things together; -- opposed to subtraction or diminution. "This endless addition or addibility of numbers." Locke.

Tending to add; making some addition. [R.] Arbuthnot.

Apt or tending to adhere; clinging. Thomson. Adhesive attraction. (Physics) See Attraction. -- Adhesive inflammation (Surg.), that kind of inflammation which terminates in the reunion of divided parts without suppuration. -- Adhesive plaster, a sticking; a plaster containing resin, wax, litharge, and olive oil.…