DI- Di-. Etym: [Gr. bis twice. See Two, and cf. Bi-, Dia-. The L. pref. dis- sometimes assumes the form di-. See Dis-.]
Defn: A prefix, signifying twofold, double, twice; (Chem.)
Defn: denoting two atoms, radicals, groups, or equivalents, as the case may be. See Bi-,
2.
DIA-; DI-
Di"a-, Di-. Etym: [Gr. Two, and cf. 1st Di-.]
Defn: A prefix denoting through; also, between, apart, asunder, across. Before a vowel dia- becomes di-; as, diactinic; dielectric, etc.
DIABASE
Di"a*base, n. Etym: [F. diabase, fr. Gr. (Min.)
Defn: A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; — often limited to rocks pretertiary in age. It includes part of what was early called greenstone.
DIABATERIAL
Di*ab`a*te"ri*al, a. Etym: [Gr. Diabase.]
Defn: Passing over the borders. [R.] Mitford.