ECHINODERMATA
Echinodermata, phylum Echinodermata
(noun) radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers
Source: WordNet® 3.1
E*chi`no*der"ma*ta, n. pl. Etym: [NL., fr. Gr. (Zoöl.)
Definition: One of the grand divisions of the animal kingdom. By many
writers it was formerly included in the Radiata. [Written also
Echinoderma.]
Note: The species usually have an exterior calcareous skeleton, or
shell, made of many pieces, and often covered with spines, to which
the name. They may be star-shaped, cylindrical, disk-shaped, or more
or less spherical. The body consists of several similar parts
(spheromeres) repeated symmetrically around a central axis, at one
end of which the mouth is situated. They generally have suckers for
locomotion. The group includes the following classes: Crinoidea,
Asterioidea, Ophiuroidea, Echinoidea, and Holothurioidea. See these
words in the Vocabulary, and also Ambulacrum.
Source: Webster’s Unabridged Dictionary 1913 Edition