plural noun Bryo·zoa \ˌbrīəˈzōə\

Definition of Bryozoa

  1. 1 :  a small phylum of aquatic animals that reproduce by budding, that usually form branching, flat, or mosslike colonies permanently attached on stones or seaweeds and enclosed by an external cuticle soft and gelatinous or rigid and chitinous or calcareous, and that consist of complex zooids each having an alimentary canal with distinct mouth and anus surrounded by a true coelom and associated with a protrusible lophophore — see avicularium, vibraculum ; bugula, entoprocta, gymnolaemata, phylactolaemata

  2. 2 in some classifications :  a class or other division of Molluscoidea comprising the Bryozoa and the Entoprocta

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of bryozoa

New Latin, from bry- + -zoa

Seen and Heard

What made you want to look up Bryozoa? Please tell us where you read or heard it (including the quote, if possible).


feeling or affected by lethargy

Get Word of the Day daily email!