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Readiness in learning; docility; aptness. He was a boy of remarkable aptitude. Macaulay.

niæ, the aqueous solution of ammonia; liquid ammonia; often called aqua ammonia. -- Aqua marine, or Aqua marina. Same as Aquamarine. -- Aqua regia. Etym: [L., royal water] (Chem.), a very corrosive fuming yellow liquid consisting of nitric and hydrochloric acids. It has the power of dissolving gold, the "royal" metal…

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

nge); also, a traffic in stocks which bear differing values at the same time in different markets.

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.

A female archer. Markham.

s called the Dean of the Arches, because he anciently held his court in the church of St. Mary-le-Bow (de arcubus). It is now held in Westminster. Mozley & W.

A group of Annelida remarkable for having no external segments or distinct ventral nerve ganglions.

Chief; primary; primordial. [Obs.] Cudworth.

let dye obtained from several species of lichen (Roccella tinctoria, etc.), which grow on maritime rocks in the Canary and Cape Verd Islands, etc. Tomlinson.

on or affection; eagerness; zeal; as, he pursues study with ardor; the fought with ardor; martial ardor.

A spot or small marked space; as, the germinative area.

To counsel, advise, warn, or direct. But mark what I aread thee now. Avaunt! Milton.

The highest judicial court at Athens. Its sessions were held on Mars' Hill. Hence, any high court or tribunal

A species of wild sheep (Ovis ammon, or O. argali), remarkable for its large horns. It inhabits the mountains of Siberia and central Asia.

A substance regarded as an element, contained in the atmosphere and remarkable for its chemical inertness. Rayleigh and Ramsay.

a discourse, writing, or artistic representation; theme or topic; also, an abstract or summary, as of the contents of a book, chapter, poem. You and love are still my argument. Shak. The abstract or argument of the piece. Jeffrey. [Shields] with boastful argument portrayed. Milton.

A genus of East Indian pheasants. The common species (A. giganteus) is remarkable for the great length and beauty of the wing and tail feathers of the male. The species A. Grayi inhabits Borneo.

Gazella, dorcas), found in Arabia and adjacent countries. (b) A squirrel-like Australian marsupial, a species of Petaurus. (c) A beautiful Brazilian toucan Ramphastos ariel).

twelve signs in the zodiac, which the sun enters at the vernal equinox, about the 21st of March.