Etymograph > Indo-European > Proto-Germanic > Dictionary > *hrugja-

N (m)

ridge; back

Source: Kroonen 2013:250
Words originating from this one
OE hrycg "back, spine, ridge" (hrugja- > hrugj > hrugi > hruġi > hryġi > hryġe) through pgmc-to-oe
(source: Kroonen 2013:250)