comb. form 1 twice, two-, double.
2 Chem. containing two atoms, molecules, or groups of a specified kind (dichromate; dioxide).
Etymology: Gk f. dis twice
2.
prefix form of DIS- occurring before l, m, n, r, s (foll. by a consonant), v, usu. g, and sometimes j.
Etymology: L var. of dis-
3.
prefix form of DIA- before a vowel.
Useful english dictionary. 2012.