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The Collaborative International Dictionary
Zooid

Zooid \Zo"oid\, a. [Zo["o]- + -oid.] (Biol.) Pertaining to, or resembling, an animal.

Zooid

Zooid \Zo"oid\, n.

  1. (Biol.) An organic body or cell having locomotion, as a spermatic cell or spermatozooid.

  2. (Zo["o]l.)

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

    2. 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.

Wiktionary
zooid

a. (context biology English) Relating to, or resembling, an animal. n. 1 (context biology English) An organic body or cell having locomotion, as a spermatic cell or spermatozoid. 2 (context zoology English) An animal in one of its inferior or early stages of development, as one of the intermediate forms in alternate generation. 3 (context zoology English) One 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.

WordNet
zooid

n. one of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan

Wikipedia
Zooid

A zooid or zoöid is a single animal that is part of a colonial animal. Zooids are multicellular; their structure is similar to that of other solitary animals. The zooids can either be directly connected by tissue (e.g. corals, Catenulida, Siphonophorae, Pyrosome or Ectoprocta) or share a common exoskeleton (e.g. Bryozoa or Pterobranchia). The colonial organism as a whole is called a zoon , plural zoa (from Greek zòon ζώον meaning animal; plural zòa, ζώα).

The term zooid has historically also been used for an organic cell or organized body that has independent movement within a living organism, especially a motile gamete such as a spermatozoon (in the case of algae now zoid), or an independent animal-like organism produced asexually, as by budding or fission.