Where does “undrained” come from?

Undrained comes from English drain, which derives from Proto-Indo-European óynos and ano-, ultimately tracing to Proto-Indo-European dʰer- meaning to hold or support.

undrained (English): Not drained; simple past tense and past...

Definitions

  1. Not drained; simple past tense and past...

Ancestry of “undrained”, step by step

undrained traces back through two separate lines of ancestry.

via English drained

StepLanguageWordMeaning
1EnglishdrainedLacking motivation and energy; very tired;...
2EnglishdrainA conduit allowing liquid to flow out of an...
3Middle Englishdreinen
4Old Englishdrēahnianto drain, strain, filter
5Proto-Germanicdrauhnōnąto strain, sieve
6Proto-Germanicdraugizhard, solid; dry
7Proto-Indo-Europeandʰerǵʰ-to strengthen; to strengthen; become hard; to...
8Proto-Indo-Europeandʰer-to support; to hold

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European dʰer-