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Pertaining to, or resembling, an animal.

An organic body or cell having locomotion, as a spermatic cell or spermatozooid.

An animal in one of its inferior stages of development, as one of the intermediate forms in alternate generation.

One of the individual animals in a composite group, as of Anthozoa, Hydroidea, and Bryozoa; -- sometimes restricted to those individuals in which the mouth and digestive organs are not developed.