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A crystalline ketone, CH3COC6H5, which may be obtained by the dry distillation of a mixture of the calcium salts of acetic and benzoic acids. It is used as a hypnotic under the name of hypnone.

ant odor, and is produced for use as an illuminating gas in a number of ways, but chiefly by the action of water on calcium carbide. Its light is very brilliant. Watts.

indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists. [Written also akene and achænium.]

A river in the Nether World or infernal regions; also, the infernal regions themselves. By some of the English poets it was supposed to be a flaming lake or gulf. Shak.

rise. Supposing faculties and powers to be the same, far more may be achieved in any line by the aid of a capital, invigorating motive than without it. I. Taylor.

The act of achieving or performing; an obtaining by exertion; successful performance; accomplishment; as, the achievement of his object.

o the bone of the heel; -- so called from the mythological account of Achilles being held by the heel when dipped in the River Styx.

n and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. -- Achromatic prism. See Prism. -- Achromatic telescope, or microscope, one in which the chromatic aberration is corrected, usually by mean…

Tissue which is not stained by fluid dyes. W. Flemming.

lor; colorless; as, in Physiol. Chem., the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine.

Dextrin not colorable by iodine. See Dextrin.

Marked with fine irregular streaks as if scratched by a needle. Lindley.

One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losi…

The measurement of the strength of acids, especially by a chemical process based on the law of chemical combinations, or the fact that, to produce a complete reaction, a certain definite weight of reagent is required. -- Ac`id*i*met"ric*al, a.

ocess of coating the surface of a metal plate (as a stereotype plate) with steellike iron by means of voltaic electricity; steeling.

s or authority of; to give recognition to. In all thy ways acknowledge Him. Prov. iii. 6. By my soul, I'll ne'er acknowledge thee. Shak.

ness. Immediately upon the acknowledgment of the Christian faith, the eunuch was baptized by Philip. Hooker.

h or give experimental knowledge of; to make (one) to know; to make familiar; -- followed by with. Before a man can speak on any subject, it is necessary to be acquainted with it. Locke. A man of sorrows and acquainted with grief. Isa. liii. 3.

having intimate, or more than slight or superficial, knowledge; personal knowledge gained by intercourse short of that of friendship or intimacy; as, I know the man; but have no acquaintance with him. Contract no friendship, or even acquaintance, with a guileful man. Sir W. Jones.

Property acquired by purchase, gift, or otherwise than by inheritance. Bouvier.