Di- (?). [Gr. 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

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

2.

© Webster 1913.

Di"a- (?), Di-. [Gr. through; orig., dividing into two parts; akin to two. See Two, and cf. 1st Di-.]

A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.

© Webster 1913.