Marine or freshwater animals that form colonies of zooids

WordNet Word definitions in WordNet
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: polyzoan , sea mat , sea moss , moss animal ] [also: bryozoa (pl)]

Wiktionary Word definitions in Wiktionary
n. 1 (plural of bryozoon English) 2 (plural of bryozoum English)

Wikipedia Word definitions in Wikipedia
The Bryozoa , also known as the Polyzoa , Ectoprocta or commonly as moss animals , are a phylum of aquatic invertebrate animals. Typically about long, they are filter feeders that sieve food particles out of the water using a retractable lophophore , a ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 ...