from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of numerous radially symmetrical marine invertebrates of the phylum Echinodermata, which includes the starfishes, sea urchins, and sea cucumbers, having an internal calcareous skeleton and often covered with spines.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any member of the Echinodermata, a group of radially symmetric, spiny-skinned marine animals. Examples of echinoderms include seastars, sea urchins, sea cucumbers, crinoids, and sand dollars.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the Echinodermata.
from The Century Dictionary and Cyclopedia
- Having a prickly covering; echinodermatous.
- n. Any one of the Echinodermata.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. marine invertebrates with tube feet and five-part radially symmetrical bodies
From New Latin Echinodermata, phylum name : echino- + -dermata, -skinned (from Greek derma, dermat-, skin; see -derm).(American Heritage® Dictionary of the English Language, Fourth Edition)
Ancient Greek ἐχῖνος ("hedgehog") + δέρμα ("skin") (Wiktionary)