*edaraz

Possibly from an old Proto-Indo-European r-stem *h₁ódʰ-r ~ *h₁édʰ-r-s, of uncertain meaning (Kroonen 2013), perhaps denoting a wooden structure, frame, edge, or enclosure; compare Proto-Slavic *odrъ (‘wooden construction; bed, platform’). The comparison is accepted by (Derksen 2008) and Kroonen but remains insecure, since the Proto-Germanic word lacks a clear deeper etymology and may alternatively reflect a different stem, possibly *h₁edʰ-e/os- (Lloyd & Springer 1988-2014). (Loma 2017) instead considers deriving *odrъ internally as an instrumental *-dʰro-formation from PIE *h₂er- (‘to fit, to fix, to put together, to slot’), which would sever it from the Proto-Germanic word.