- (Biol.) An organic body or cell having locomotion, as a spermatic cell or spermatozooid.
- (Zoí¶l.) (a) An animal in one of its inferior stages of development, as one of the intermediate forms in alternate generation. (b) 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.
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Full Definition of zooid