[1] : The Collaborative International Dictionary of English v.0.48

zooid \zo"oid\, a. zoo- + -oid. biol.
   pertaining to, or resembling, an animal.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

zooid \zo"oid\, n.
   1. biol. an organic body or cell having locomotion, as a
      spermatic cell or spermatozooid.
      1913 webster

   2. zool.
      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.
          1913 webster

[3] : WordNet (r) 2.0

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

Zooid >> Z Words
Zooid, definition of term: Zooid
zooid_pag1.html