Dualisticsystem or theory(Chem.), the theory, originated by Lavoisier and developed by Berzelius, that all definite compounds are binary in their nature, and consist of two distinct constituents, themselves simple or complex, and possessed of opposite chemical or electrical affinities.

(Du"al"i*ty) n. [L. dualitas: cf. F. dualité.] The quality or condition of being two or twofold; dual character or usage.

(Du"an) n. [Gael. & Ir.] A division of a poem corresponding to a canto; a poem or song. [R.]

(Du"ar*chy) n. [Gr. two + - archy.] Government by two persons.

(Dub) v. t. [imp. & p. p. Dubbed (dubd); p. pr. & vb. n. Dubbing.] [AS. dubban to strike, beat ("dubbade his sunu . . . to ridere." AS. Chron. an. 1086); akin to Icel. dubba; cf. OF. adouber (prob. fr. Icel.) a chevalier, Icel. dubba til riddara.]

1. To confer knighthood upon; as, the king dubbed his son Henry a knight.

The conclusion of the ceremony was marked by a tap on the shoulder with the sword.

2. To invest with any dignity or new character; to entitle; to call.

A man of wealth is dubbed a man of worth.

(Dry"-stone`) a. Constructed of uncemented stone. "Dry-stone walls." Sir W. Scott.

(Dryth or Drith), n. Drought. [Obs.] Tyndale.

(Du"ad) n. [See Dyad.] A union of two; duality. [R.] Harris.

(Du"al) a. [L. dualis, fr. duo two. See Two.] Expressing, or consisting of, the number two; belonging to two; as, the dual number of nouns, etc. , in Greek.

Here you have one half of our dual truth.

(Du"a*lin) n. (Chem.) An explosive substance consisting essentially of sawdust or wood pulp, saturated with nitroglycerin and other similar nitro compounds. It is inferior to dynamite, and is more liable to explosion.

(Du"al*ism) n. [Cf. F. dualisme.] State of being dual or twofold; a twofold division; any system which is founded on a double principle, or a twofold distinction; as: (a) (Philos.) A view of man as constituted of two original and independent elements, as matter and spirit. (Theol.) (b) A system which accepts two gods, or two original principles, one good and the other evil. (c) The doctrine that all mankind are divided by the arbitrary decree of God, and in his eternal foreknowledge, into two classes, the elect and the reprobate. (d) (Physiol.) The theory that each cerebral hemisphere acts independently of the other.

An inevitable dualism bisects nature, so that each thing is a half, and suggests another thing to make it whole.

(Du"al*ist), n. [Cf. F. dualiste.]

1. One who believes in dualism; a ditheist.

2. One who administers two offices. Fuller.

(Du`al*is"tic) a. Consisting of two; pertaining to dualism or duality.

  By PanEris using Melati.

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