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Definition of Zoöid
1. Noun. (biology) An organic body or cell having locomotion, as a spermatic cell or spermatozoid. ¹
2. Noun. (zoology) An animal in one of its inferior or early stages of development, as one of the intermediate forms in alternate generation. ¹
3. Noun. (zoology) 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. ¹
4. Noun. (alternative spelling of zooid) ¹
¹ Source: wiktionary.com