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.
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Bi- \Bi-\ [L. bis twice, which in composition drops the -s, akin
to E. two. See Bis-, Two, and cf. Di-, Dis-.]
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1. In most branches of science bi- in composition denotes
two, twice, or doubly; as, bidentate, two-toothed;
biternate, doubly ternate, etc.
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2. (Chem.) In the composition of chemical names bi- denotes
two atoms, parts, or equivalents of that constituent to
the name of which it is prefixed, to one of the other
component, or that such constituent is present in double
the ordinary proportion; as, bichromate, bisulphide. Be-
and di- are often used interchangeably.
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