(Optics), a large lens constructed in several parts or layers, extending in a succession of annular rings beyond the central lens; — used in lighthouses.

(Ech"e*lon) v. t. (Mil.) To place in echelon; to station divisions of troops in echelon.

(Ech"e*lon), v. i. To take position in echelon.

Change direction to the left, echelon by battalion from the right.

(||E*chid"na) n. [L., a viper, adder, Gr. 'e`chidna.]

1. (Gr. Myth.) A monster, half maid and half serpent.

2. (Zoöl.) A genus of Monotremata found in Australia, Tasmania, and New Guinea. They are toothless and covered with spines; — called also porcupine ant-eater, and Australian ant-eater.

(E*chid"nine) n. [See Echidna.] (Chem.) The clear, viscid fluid secreted by the poison glands of certain serpents; also, a nitrogenous base contained in this, and supposed to be the active poisonous principle of the virus. Brande & C.

(Ech"i*nate Ech"i*na`ted) a. [L. echinatus. See Echinus.] Set with prickles; prickly, like a hedgehog; bristled; as, an echinated pericarp.

(E*chi"nid) a. & n. (Zoöl.) Same as Echinoid.

(E*chin"i*dan) n. [Cf. F. échinide.] (Zoöl.) One the Echinoidea.

(E*chin"i*tal) a. Of, or like, an echinite.

(Ech"i*nite) n. [Cf. F. échinite. See Echinus.] (Paleon.) A fossil echinoid.

(||E*chi`no*coc"cus) n. [NL., fr. Gr. hedgehog, sea urchin + grain, seed. So called because forming little granular bodies, each armed with hooklets and disposed upon the inner wall of the hydatid cysts.] (Zoöl.) A parasite of man and of many domestic and wild animals, forming compound cysts or tumors (called hydatid cysts) in various organs, but especially in the liver and lungs, which often cause death. It is the larval stage of the Tænia echinococcus, a small tapeworm peculiar to the dog.

(E*chin"o*derm`) n. (Zoöl.) One of the Echinodermata.

(E*chi`no*der"mal) a. (Zoöl.) Relating or belonging to the echinoderms.

(||E*chi`no*der"ma*ta) n. pl. [NL., fr. Gr. 'echi^nos hedgehog, sea urchin + de`rma, - atos, skin.] (Zoöl.) One of the grand divisions of the animal kingdom. By many writers it was formerly included in the Radiata. [Written also Echinoderma.]

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.

(E*chi`no*der"ma*tous) a. (Zoöl.) Relating to Echinodermata; echinodermal.

(E*chi"noid) a. [Echinus + -oid.] (Zoöl.) Of or pertaining to the Echinoidea.n. One of the Echinoidea.

Echelon lens

  By PanEris using Melati.

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