Source : Webster's Revised Unabridged Dictionary (1913)

Echinodermata \E*chi`no*der"ma*ta\
   ([-e]*k[imac]`n[-o]*d[~e]r"m[.a]*t[.a]), n. pl. [NL., fr. Gr.
   'echi^nos hedgehog, sea urchin + de`rma, -atos, skin.]
   (Zo["o]l.)
   One of the grand divisions of the animal kingdom. By many
   writers it was formerly included in the Radiata. [Written
   also {Echinoderma}.]

Source : WordNet®

Echinodermata
     n : radially symmetrical marine invertebrates including e.g.
         starfish and sea urchins and sea cucumbers [syn: {phylum
         Echinodermata}]