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

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

Pertaining to the part of a radiate animal which contains the mouth. L. Agassiz.

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.].

The mouth or anterior opening of a coelenterate animal.

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

In an active manner; nimbly; briskly; energetically; also, by one's own action; voluntarily, not passively.

The quality of being active; nimbleness; quickness of motion; activity.

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.

Without claws on the feet (of crustaceous animals).

An animal having feet that are not apparent.

Animal fat; lard.

Of or pertaining to animal fat; fatty. Adipose fin (Zoöl.), a soft boneless fin. -- Adipose tissue (Anat.), that form of animal tissue which forms or contains fat.

adherent to a stem; -- a term applied to the lateral zooids of corals and other compound animals.

in the male sex, from fourteen to twenty-one. Sometimes used with reference to the lower animals.

A person, animal, or plant grown to full size and strength; one who has reached maturity.

In an adverse manner; inimically; unfortunately; contrariwise.

The whole duration of a being, whether animal, vegetable, or other kind; lifetime. Mine age is as nothing before thee. Ps. xxxix. 5.

(Zoöl.) United into a common organized mass; -- said of certain compound animals.

Having the faculty of quick motion in the limbs; apt or ready to move; nimble; active; as, an agile boy; an agile tongue. Shaking it with agile hand. Cowper.