Source : Webster's Revised Unabridged Dictionary (1913)

Polyzoa \Pol`y*zo"a\, n. pl. [NL., fr. Gr. poly`s many + ? an
   animal.] (Zo["o]l.)
   Same as {Bryozoa}. See Illust. under {Bryozoa}, and
   {Phylactol[ae]mata}.

Polyzoon \Pol`y*zo"["o]n\, n.; pl. {Polyzoa}. [NL. See
   {Polyzoan}.] (Zo["o]l.)
   One of the individual zooids forming the compound organism of
   a polyzoan.

Bryozoa \Bry`o*zo"a\, n. pl. [NL., fr. Gr. ? moss + ? animal.]
   (Zo["o]l.)
   A class of Molluscoidea, including minute animals which by
   budding form compound colonies; -- called also {Polyzoa}.

   Note: They are often coralike in form and appearance, each
         small cell containing an individual zooid. Other
         species grow in delicate, flexible, branched forms,
         resembling moss, whence the name. Some are found in
         fresh water, but most are marine. The three principal
         divisions are {Ectoprocta}, {Entoprocta}, and
         {Pterobranchia}. See {Cyclostoma}, {Chilostoma}, and
         {Phylactolema}.

Source : WordNet®

polyzoa
     n : marine or freshwater animals that form colonies of zooids
         [syn: {Bryozoa}, {phylum Bryozoa}]

polyzoan
     n : sessile aquatic animal forming mosslike colonies of small
         polyps each having a curved or circular ridge bearing
         tentacles; attach to stones or seaweed and reproduce by
         budding [syn: {bryozoan}, {sea mat}, {sea moss}, {moss
         animal}]
     [also: {polyzoa} (pl)]

polyzoa
     See {polyzoan}