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Ancient; pertaining to the earliest period in geological history.

Relating to archæology, or antiquities; as, archæological researches. -- Ar`*chæ*o*log"ic*al*ly, adv.

A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebræ with feathers along each side, and jaws armed with teeth, with other reptilian characteristics.

nt, antiquated, or old-fashioned, word, expression, or idiom; a word or form of speech no longer in common use.

Of or pertaining to Archimedes, a celebrated Greek philosopher; constructed on the principle of Archimedes' screw; as, Archimedean drill, propeller, etc. Archimedean screw, or Archimedes' screw, an instrument, said to have been invented by Archimedes, for raising water, formed by winding a flexible tube round a cylinde…

The lower division of an entablature, or that part which rests immediately on the column, esp. in classical architecture. See Column.

nner; with attractive slyness or roguishness; slyly; waggishly. Archly the maiden smiled. Longfellow.

Warmth of passion or affection; ardor; vehemence; eagerness; as, the ardency of love or zeal.

Having the appearance or quality of fire; fierce; glowing; shining; as, ardent eyes. Dryden.

Steep and lofty, in a literal sense; hard to climb. Those arduous pats they trod. Pope.

Burning; ardent. [R.] Lo! further on, Where flames the arduous Spirit of Isidore. Cary.

Any plane surface, as of the floor of a room or church, or of the ground within an inclosure; an open space in a building. The Alban lake . . . looks like the area of some vast amphitheater. Addison.

reolæ. reolar tissue (Anat.), a form of fibrous connective tissue in which the fibers are loosely arranged with numerous spaces, or areolæ, between them.

or containing, silver; -- said of certain compounds of silver in which this metal has its lowest proportion; as, argentic chloride.

A genus of copepod Crustacea, parasitic of fishes; a fish louse. See Branchiura.

proofs; argumentation; discussion; disputation. The argument is about things, but names. Locke.

A exterior covering, forming a false coat or appendage to a seed, as the loose, transparent bag inclosing the seed or the white water lily. The mace of the nutmeg is also an aril. Gray.

To come up from a lower to a higher position; to come above the horizon; to come up from one's bed or place of repose; to mount; to ascend; to rise; as, to arise from a kneeling posture; a cloud arose; the sun ariseth; he arose early in the morning.

arithmetic; according to the rules or method of arithmetic. Arithmetical complement of a logarithm. See Logarithm. -- Arithmetical mean. See Mean. -- Arithmetical progression. See Progression. -- Arithmetical proportion. See Proportion.

A limb, or locomotive or prehensile organ, of an invertebrate animal.