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A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl.

Achievement. [Obs.] Sir T. Elyot.

justed 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 means of a compound or achromatic object glass,…

g their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are calle…

That variety of either the Bessemer or the open-hearth process in which the converter or hearth is lined with acid, that is, highly siliceous, material. Opposed to basic process.

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.

Materia medica; the science of remedies.

Acquirement. [Obs.] Barrow.

The thing acquired or gained; an acquirement; a gain; as, learning is an acquisition.

Chronic enlargement of the extremities and face.

; a performance; a deed. That best portion of a good man's life, His little, nameless, unremembered acts Of kindness and of love. Wordsworth. Hence, in specific uses:

Pertaining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic.

The measurement of the force of solar radiation. Maury.

t; a thing done; a deed; an enterprise. (pl.): Habitual deeds; hence, conduct; behavior; demeanor. The Lord is a Good of knowledge, and by him actions are weighed. 1 Sam. ii. 3.

Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal. Active and nervous was his gait. Wordsworth.

A making actual or really existent. [R.] Emerson.

A bringing into action; movement. Bp. Pearson.

The insertion of needles into the living tissues for remedial purposes.

Slow; slowly, leisurely, and gracefully. When repeated, adagio, adagio, it directs the movement to be very slow.

me to be of impenetrable hardness; a name given to the diamond and other substance of extreme hardness; but in modern minerology it has no technical signification. It is now a rhetorical or poetical name for the embodiment of impenetrable hardness. Opposed the rocky orb Of tenfold adamant, his ample shield. Milton.…