Usually means: Marine invertebrates with spiny skin.
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We found 26 dictionaries that define the word echinoderm:

General (21 matching dictionaries)
  1. echinoderm: Merriam-Webster
  2. echinoderm: Oxford Learner's Dictionaries
  3. echinoderm: American Heritage Dictionary of the English Language
  4. echinoderm: Collins English Dictionary
  5. echinoderm: Vocabulary.com
  6. echinoderm: Wordnik
  7. echinoderm: Cambridge Advanced Learner's Dictionary
  8. echinoderm: Wiktionary
  9. echinoderm: Webster's New World College Dictionary, 4th Ed.
  10. echinoderm: The Wordsmyth English Dictionary-Thesaurus
  11. echinoderm: Infoplease Dictionary
  12. echinoderm: Dictionary.com
  13. echinoderm: Online Etymology Dictionary
  14. Echinoderm: Wikipedia, the Free Encyclopedia
  15. Echinoderm: Online Plain Text English Dictionary
  16. echinoderm: Webster's Revised Unabridged, 1913 Edition
  17. echinoderm: Rhymezone
  18. Echinoderm: AllWords.com Multi-Lingual Dictionary
  19. echinoderm: FreeDictionary.org
  20. echinoderm: Mnemonic Dictionary
  21. echinoderm: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. echinoderm: Encyclopedia

Medicine (2 matching dictionaries)
  1. echinoderm: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)

Science (2 matching dictionaries)
  1. echinoderm: Evolution Glossary
  2. Fishkeeping glossary (No longer online)

(Note: See echinodermatous as well.)

Definitions from Wiktionary (echinoderm)

noun:  An animal of the phylum Echinodermata, comprising radially symmetric, spiny-skinned marine animals including seastars, sea urchins, sea cucumbers, crinoids, and sand dollars.

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