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



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24 February 2025

ANOMALY

(noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)


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