Defn: A hedgehog.

2. (Zoöl.)

Defn: A genus of echinoderms, including the common edible sea urchin of Europe.

3. (Arch.) (a) The rounded molding forming the bell of the capital of the Grecian Doric style, which is of a peculiar elastic curve. See Entablature. (b) The quarter-round molding (ovolo) of the Roman Doric style. See Illust. of Column (c) A name sometimes given to the egg and anchor or egg and dart molding, because that ornament is often identified with Roman Doric capital. The name probably alludes to the shape of the shell of the sea urchin.

ECHIUROIDEA Ech`i*u*roi"de*a, n. pl. Etym: [NL., fr. echiurus, the name of one genus (Gr. -oid.] (Zoöl.)

Defn: A division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans.

ECHO Ech"o, n.; pl. Echoes. Etym: [L. echo, Gr. va to sound, bellow; perh. akin to E. voice: cf. F. écho.]

1. A sound reflected from an opposing surface and repeated to the ear of a listener; repercussion of sound; repetition of a sound. The babbling echo mocks the hounds. Shak. The woods shall answer, and the echo ring. Pope.

2. Fig.: Sympathetic recognition; response; answer.
Fame is the echo of actions, resounding them. Fuller.
Many kind, and sincere speeches found an echo in his heart. R. L.
Stevenson.

3. (a) (Myth. & Poetic) A wood or mountain nymph, regarded as repeating, and causing the reverberation of them. Sweet Echo, sweetest nymph, that liv'st unseen Within thy airy shell. Milton. (b) (Gr. Myth.)