any of the marine invertebrate animals constituting the phylum Echinodermata, characterized by tube feet, a calcite body-covering (test), and a five-part symmetrical body. The group includes the starfish, sea urchins, and sea cucumbers
WordReference Random House Unabridged Dictionary of American English © 2025
e•chi•no•derm
(i kī′nə dûrm′, ek′ə nə-),USA pronunciation n.
- Invertebratesany marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins, sea cucumbers, etc.
- Greek echîn(os) sea urchin + -o- -o- + -dermatos -dermatous
- taken as singular of Neo-Latin Echinodermata, neuter plural of echinodermatus 1825–35
Collins Concise English Dictionary © HarperCollins Publishers::
'echinoderm' also found in these entries (note: many are not synonyms or translations):
ambulacrum
- asteroid
- asteroidean
- basket star
- brittle star
- brittle-star
- crinoid
- echinodermatous
- echinoid
- heart urchin
- holothurian
- ophiuroid
- papula
- sea cucumber
- sea urchin
- starfish