Where does “hohlraum” come from?

hohlraum (English) comes from German Hohlraum, 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 (English): A cavity whose walls are in thermodynamic...

Definitions

  1. A cavity whose walls are in thermodynamic...

Ancestry of “hohlraum”, step by step

StepLanguageWordMeaning
1GermanHohlraumcavity; void, hollow
2Germanhohlhollow; concave; cupped; dense; daft
3Old High Germanholhollow
4Proto-West Germanicholhollow; hole
5Proto-Germanichuląa hollow; depression; hole
6Proto-Germanichulazhollow
7Proto-Indo-Europeanḱel-to cover; to incline
Every word from Proto-Indo-European ḱel- →Every word from Proto-Germanic hulaz →Every word from Proto-Germanic hulą →