Where does “or-” come from?

or- (Old Dutch) comes from Proto-Germanic uz-, from Proto-Indo-European uss-, from Proto-Indo-European uds-, from Proto-Indo-European úd — out, outward.

Ancestry of “or-”, step by step

StepLanguageWordMeaning
1Proto-Germanicuz-up, out
2Proto-Indo-Europeanuss-—
3Proto-Indo-Europeanuds-up, out
4Proto-Indo-Europeanúdout, outward

Words derived from “or-”

Every word from Proto-Indo-European úd →Every word from Proto-Indo-European uds- →Every word from Proto-Indo-European uss- →