
German word oder comes from Proto-Indo-European *h₂énteros (Second, other.), Proto-Indo-European *ánteros, Proto-Germanic *efþau (Or.)
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*h₂énteros (Proto-Indo-European)
Second, other.
*ánteros (Proto-Indo-European)
*efþau (Proto-Germanic)
Or.
*anþeraz (Proto-Germanic)
Other (of two). Second.
odar (Old High German)
Or.
oder (German)
(tag question) right?; is it?; is it not? Or.