Meaning of DI- in English

DI-

[di-] comb form [ME, fr. MF, fr. L, fr. Gk; akin to OE twi-] 1: twice: twofold: double "dichromatic"

2: containing two atoms, radicals, or groups "dioxide"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.