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The Collaborative International Dictionary of English v.0.48 (gcide)

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


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]


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]


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]


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]