Where does “underdense” come from?

underdense (English) comes from English under, from Middle English under, from Old English under, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

underdense (English): Insufficiently dense; especially not sufficiently...

Definitions

  1. Insufficiently dense; especially not sufficiently...

Ancestry of “underdense”, step by step

underdense traces back through two separate lines of ancestry.

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside

via English dense

StepLanguageWordMeaning
1EnglishdenseHaving relatively high density; Compact; crowded...
2Middle Frenchdense—
3Latindēnsusdense, compact
4Proto-Indo-Europeandens-to teach; thick, dense
Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →