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l vesicle, or hy datid, filled with fluid, sometimes found in the tissues of man and the lower animals; -- so called from the absence of a head or visible organs on the vesicle. These cysts are the immature stages of certain tapeworms. Also applied to similar cysts of different origin.

to perform; -- as, to achieve a feat, an exploit, an enterprise. 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.

e lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown 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. --…

er, 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 losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radica…

yhold tenants, on the death of their landlords, as an acknowledgment of their new lords. Cowell.

nation. 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.

A plant which has no cotyledons, as the dodder and all flowerless plants.

The measuring of the power or extent of hearing.

urnish 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.

position or discontent); to accept or consent by silence or by omitting to object; -- followed by in, formerly also by with and to. They were compelled to acquiesce in a government which they did not regard as just. De Quincey.

sive assent or submission, or a submission with apparent content; -- distinguished from avowed consent on the one hand, and on the other, from opposition or open discontent; quiet satisfaction.

from an obligation, duty, liability, burden, or from an accusation or charge; -- now followed by of before the charge, formerly by from; as, the jury acquitted the prisoner; we acquit a man of evil intentions.

The lowest group of Vertebrata, including the amphioxus, in which no skull exists.

The lowest groups of animals, in which no nervous system has been observed.

Acritan. Owen.

That which is done or doing; the exercise of power, or the effect, of which power exerted is the cause; 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:

An animal of the class Anthozoa, and family Actinidæ. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.].

An instrument for measuring the direct heating power of the sun's rays.

r condition of acting or moving, as opposed to rest; the doing of something; exertion of power or force, as when one body 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.…

Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to Ant: passive, that receives; as, certain active principles; the powers of the mind.