Webster's Revised Unabridged Dictionary -- Volume DE

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.

-- Dualistic system 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 (dŭb), v. t. [imp. & p. p. Dubbed (dŭbd); p. pr. & vb. n. Dubbing.] [AS. dubban to strike, beat ("dubbade his sunu . . . to rīdere." 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.
Pope.

3. To clothe or invest; to ornament; to adorn. [Obs.]

His diadem was dropped down
Dubbed with stones.
Morte d'Arthure.