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The Collaborative International Dictionary of English v.0.48:

Di- \Di-\ [Gr. di`s- 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; (Chem.) denoting two atoms, radicals, groups, or equivalents, as the case may be. See Bi-, 2. Dia
The Collaborative International Dictionary of English v.0.48:

Dia- \Di"a-\, Di- \Di-\ . [Gr. dia` 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. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Deuto- \Deu"to-\or Deut- \Deut-\ (d[=u]t-)[Contr. from Gr. dey`teros second.] (Chem.) A prefix which formerly properly indicated the second in a regular series of compound in the series, and not to its composition, but which is now generally employed in the same sense as bi- or di-, although little used. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

dis- \dis-\ (?; 258) 1. A prefix from the Latin, whence F. d['e]s, or sometimes d['e]-, dis-. The Latin dis-appears as di-before b, d, g, l, m, n, r, v, becomes dif-before f, and either dis-or di- before j. It is from the same root as bis twice, and duo, E. two. See Two, and cf. Bi-, Di-, Dia-. Dis- denotes separation, a parting from, as in distribute, disconnect; hence it often has the force of a privative and negative, as in disarm, disoblige, disagree. Also intensive, as in dissever. [1913 Webster] Note: Walker's rule of pronouncing this prefix is, that the s ought always to be pronounced like z, when the next syllable is accented and begins with "a flat mute [b, d, v, g, z], a liquid [l, m, n, r], or a vowel; as, disable, disease, disorder, disuse, disband, disdain, disgrace, disvalue, disjoin, dislike, dislodge, dismay, dismember, dismiss, dismount, disnatured, disrank, disrelish, disrobe." Dr. Webster's example in disapproving of Walker's rule and pronouncing dis-as diz in only one (disease) of the above words, is followed by recent ortho["e]pists. See Disable, Disgrace, and the other words, beginning with dis-, in this Dictionary. [1913 Webster] 2. A prefix from Gr. di`s- twice. See Di-. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Disserve \Dis*serve"\, v. t. [imp. & p. p. Di?????; p. pr. & vb. n. Disserving.] [Pref. dis- + serve: cf. F. desservir.] To fail to serve; to do injury or mischief to; to damage; to hurt; to harm. [1913 Webster] Have neither served nor disserved the interests of any party. --Jer. Taylor. [1913 Webster]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):

DI Destination Index [register] (CPU, Intel, assembler)