1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: 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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