4. The process of cleaning or brightening sheet metal or metalware, esp. brass, by dipping it in acids, etc.
5. The practice of taking snuff by rubbing the teeth or gums with a stick or brush dipped in snuff. [U.S.]
Dipping needle, a magnetic needle suspended at its center of gravity, and moving freely in a vertical plane, so as to indicate on a graduated circle the magnetic dip or inclination.
Di`pris*mat"ic (?), a. [Prefix di- + prismatic.] Doubly prismatic.
Di`pro*par"gyl (?), n. [Prefix di- + propargyl.] (Chem.) A pungent, mobile, volatile liquid, C6H6, produced artificially from certain allyl derivatives. Though isomeric with benzine, it is very different in its chemical relations. Called also dipropinyl.
Di*pro"pyl (?), n. [Pref. di- + propyl.] (Chem.) One of the hexane paraffins, found in petroleum, consisting of two propyl radicals. See Hexane.
||Di*pro"to*don (?), n. [Gr. di- = di`s- twice + &?; first + 'odoy`s, 'odo`ntos, tooth.] (Paleon.) An extinct Quaternary marsupial from Australia, about as large as the hippopotamus; -- so named because of its two large front teeth. See Illustration in Appendix.
Dip"sas (?), n. [L., fr. Gr. &?;, fr. &?; thirst.] 1. A serpent whose bite was fabled to produce intense thirst. Milton.