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 (db), v. t. [imp. & p. p. Dubbed (dbd); p. pr. & vb. n. Dubbing.] [AS. dubban to strike, beat ("dubbade his sunu . . . to rdere." 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.