Where does “undammable” come from?

undammable (English) comes from English dammable, from English dam, from English damn, from Middle English dampnen, from Old French dampner, from Latin damnō, from Latin damnum, from Proto-Italic dapnom — to share, divide.

undammable (English): That cannot be dammed

Definitions

  1. That cannot be dammed

Ancestry of “undammable”, step by step

undammable traces back through two separate lines of ancestry.

via English dammable

StepLanguageWordMeaning
1EnglishdammableThat can be dammed
2EnglishdamA structure placed across a flowing body of water...
3EnglishdamnTo condemn to hell; To condemn; to declare...
4Middle Englishdampnento damn
5Old Frenchdampnerto damn
6Latindamnōto discredit, find fault, disapprove, reject
7Latindamnumdamage or injury; loss; a fine
8Proto-Italicdapnom
9Proto-Indo-Europeandh₂pnómexpense, investment
10Proto-Indo-Europeandeh₂p-to sacrifice; to lose
11Proto-Indo-Europeandeh₂-to share, divide

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European deh₂-