bryozoan

from WordNet (r) 3.0 (2006)

bryozoan
    n 1: sessile aquatic animal forming mossy colonies of small
         polyps each having a curved or circular ridge bearing
         tentacles; attach to stones or seaweed and reproduce by
         budding [syn: {bryozoan}, {polyzoan}, {sea mat}, {sea
         moss}, {moss animal}]

from The Collaborative International Dictionary of English v.0.48

Bryozoan \Bry`o*zo"an\, a. (Zool.)
   Of or pertaining to the Bryozoa. -- n. One of the Bryozoa.
   [1913 Webster]