Di– (?). [Gr. δίσ- twice; akin to � two, L. bis twice. See Two, and cf. Bi-, Dia-. The L. pref. dis- sometimes assumes the form di-. See Dis-.] A prefix, signifying twofold, double, twice; (Chem.) denoting two atoms, radicals, groups, or equivalents, as the case may be. See Bi-, 2.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.