Where does “Hohlraum” come from?

Hohlraum (German) comes from German hohl, from Old High German hol, from Proto-West Germanic hol, from Proto-Germanic hulą, from Proto-Germanic hulaz, from Proto-Indo-European ḱel- — to cover; to incline.

Hohlraum (German): cavity; void, hollow

Definitions

  1. cavity; void, hollow

Ancestry of “Hohlraum”, step by step

Hohlraum traces back through two separate lines of ancestry.

via German hohl

StepLanguageWordMeaning
1Germanhohlhollow; concave; cupped; dense; daft
2Old High Germanholhollow
3Proto-West Germanicholhollow; hole
4Proto-Germanichuląa hollow; depression; hole
5Proto-Germanichulazhollow
6Proto-Indo-Europeanḱel-to cover; to incline

via German raum

StepLanguageWordMeaning
1Germanraumwide; space
2Middle High Germanrūm—
3Old High Germanrūm—
4Proto-West Germanicrūmroomy, spacious; room, open space
5Proto-Germanicrūmazroomy, spacious, open
6Proto-Indo-Europeanrewh₁-free space

Words derived from “Hohlraum”

Every word from Proto-Indo-European ḱel- →
Hohlraum — Etymology, Origin & Word History | Etymology Explorer