Where does “grottrum” come from?

grottrum (Swedish) comes from Swedish rum, from Old Norse rúm, from Proto-Germanic rūmą, from Proto-Indo-European rewh₁- — free space.

grottrum (Swedish): a cavern (chamber in a cave)

Definitions

  1. a cavern (chamber in a cave)

Ancestry of “grottrum”, step by step

grottrum traces back through two separate lines of ancestry.

via Swedish rum

StepLanguageWordMeaning
1Swedishrumroom; part of a building; room; empty, available...
2Old Norserúmroom; space
3Proto-Germanicrūmąroom, open space
4Proto-Indo-Europeanrewh₁-free space

via Swedish grotta

StepLanguageWordMeaning
1Swedishgrottacave
Every word from Proto-Indo-European rewh₁- →Every word from Proto-Germanic rūmą →Every word from Old Norse rúm →