Eastern
来自Big Physics
Old English ēasterne (as east, -ern).
wiktionary
From Middle English esturne, esterne, from Old English ēasterne(“eastern”), from Proto-Germanic *austrōnijaz(“eastern”), from Proto-Indo-European*h₂ews-ro-(“eastern”), from Proto-Indo-European *h₂ews-(“dawn, east”). Cognate with Old Saxon and Old High German ōstrōni(“eastern”), Old Norse austrœnn(“eastern”).
Morphologically east + -ern.
etymonline
eastern (adj.)
Old English easterne "of the east, from the east; oriental; of the Eastern Orthodox Church; of the eastern part of the globe," from east + -erne, suffix denoting direction. Cognate with Old Saxon ostroni, Old High German ostroni, Old Norse austroenn. Eastern Shore of Maryland and Virginia so called from 1620s.
