Etymology Explorer › Proto-Indo-European

Where does “duo-” come from?

duo- (Proto-Indo-European) comes from Proto-Indo-European du — two; binary, consisting of two.

Ancestry of “duo-”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeandutwo; binary, consisting of two

Words derived from “duo-”

  • dej
  • duai-au
Every word from Proto-Indo-European du →