Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary


noun echi·no·derm \i-ˈkī-nə-ˌdərm\

Definition of echinoderm

  1. :  any of a phylum (Echinodermata) of radially symmetrical coelomate marine animals including the starfishes, sea urchins, and related forms


play \-ˌkī-nə-ˈdər-mə-təs\ adjective

Origin and Etymology of echinoderm

New Latin Echinodermata, phylum name, from echin- + -dermata (ultimately from Greek derma skin)

First Known Use: 1835

Rhymes with echinoderm

Learn More about echinoderm

Seen and Heard

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