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rom 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, and which gives images free from extraneous color.

or liquors. Also fig.: Sour-tempered. He was stern and his face as acid as ever. A. Trollope.

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.

Operative surgery.

of one's own act, to give it legal validity; as, the acknowledgment of a deed before a proper officer. Also, the certificate of the officer attesting such declaration. Acknowledgment money, in some parts of England, a sum paid by copyhold tenants, on the death of their landlords, as an acknowledgment of their new lord…

top or highest point; the culmination. The very acme and pitch of life for epic poetry. Pope. The moment when a certain power reaches the acme of its supremacy. I. Taylor.

ustic vessels, brazen tubes or vessels, shaped like a bell, used in ancient theaters to propel the voices of the actors, so as to render them audible to a great distance.

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

- distinguished from avowed consent on the one hand, and on the other, from opposition or open discontent; quiet satisfaction.

The quality of being acquisitive; propensity to acquire property; desire of possession.

Possessing acres or landed property; -- used in composition; as, large-acred men.

One who practices rope dancing, high vaulting, or other daring gymnastic feats.

o action; to actuate; to animate. [Obs.] Self-love, the spring of motion, acts the soul. Pope.

Operating in any way.

The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography.

The mouth or anterior opening of a coelenterate animal.

dy acts on another; the effect of power exerted on one body by another; agency; activity; operation; as, the action of heat; a man of action. One wise in council, one in action brave. Pope.

Given to action rather than contemplation; practical; operative; - - opposed to Ant: speculative or Ant: theoretical; as, an active rather than a speculative statesman.

The state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force; as, an increasing variety of human activities. "The activity of toil." Palfrey.

A registar or clerk; -- used originally in courts of civil law jurisdiction, but in Europe used for a clerk or registar generally.