Definitions
1.nounAn organic body or cell having locomotion, as a spermatic cell or spermatozoid.
2.nounAn animal in one of its inferior or early stages of development, as one of the intermediate forms in alternate generation.
3.nounOne of the individual animals in a composite group, as of Anthozoa, Hydrozoa, and Bryozoa; — sometimes restricted to those individuals in which the mouth and digestive organs are not developed.
4.adjectiveRelating to, or resembling, an animal.