from The Century Dictionary and Cyclopedia
- n. The sponges, Spongiozoa or Porifera, regarded as a prime division of the animal kingdom, of equal rank with Protozoa and Metazoa.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. multicellular organisms having less-specialized cells than in the Metazoa; comprises the single phylum Porifera
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