WordWeight : Weighing the Words

Pronunciation : Di-.
Etymology : [Gr. bis twice. See Two, and cf. Bi-, Dia-. The L. pref. dis- sometimes assumes the form di-. See Dis-.]
Definition : Defn: A prefix, signifying twofold, double, twice; (Chem.)

Defn: denoting two atoms, radicals, groups, or equivalents, as the case may be. See Bi-,

2.
Source : Webster's Unabridged Dictionary, 1913