n pl :  a phylum of more or less radially symmetrical invertebrate animals that lack a true body cavity, possess tentacles studded with nematocysts, and include the hydroids, jellyfishes, sea anemones, and corals .
 
 
 
Similar sounding terms:   contour   counter 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.