bryozoan

n.
Any of various small aquatic animals of the phylum Bryozoa that reproduce by budding and form mosslike or branching colonies permanently attached to stones or seaweed. Also called moss animal, polyzoan.

adj.
Of or belonging to the Bryozoa.

[From New Latin Bryozōa, phylum name : BRYO- + Greek zōia, pl. of zōion, animal; see -zoon.]

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The noun has one meaning:

Meaning #1: 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
  Synonyms: polyzoan, sea mat, sea moss, moss animal

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