Usually occurs in sessile colonies

• Primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework

WordNet Word definitions in WordNet
n. primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies [syn: sponge , parazoan ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Poriferan \Po*rif"er*an\, n. (Zo["o]l.) One of the Polifera.

Wiktionary Word definitions in Wiktionary
n. (context biology English) Any sponge of the phylum ''Porifera''.