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Re:The dwarfs of our vocabulary by pebers on Tuesday August 15, 2017 @05:50PM (#15023008)
Interesting, did not know that. He implies (but doesn't say flat-out and it could indeed be a retcon) in the foreword to The Hobbit that it's deliberate:

  In English the only correct plural of dwarf is dwarfs, and the adjective
  is dwarfish. In this story dwarves and dwarvish are used, but only when
  speaking of the ancient people to whom Thorin Oakenshield and his 
  companions belonged.
I've not heard of any usage of it pre-Tolkien though, and can't find anything obvious after a bit of searching (mostly "dwarvish" turns up Tolkien related things). Anything you can point me to there?
Re:The dwarfs of our vocabulary by thaumasiotes on Tuesday August 15, 2017 @06:38PM (#15023383)
>> In English the only correct plural of dwarf is dwarfs

etymonline points out that the form with a better-in-some-sense claim to be "correct" is dwarrows, not "dwarfs". But that term was uncommon enough that it completely died out. ( http://www.etymonline.com/index.php?term=dwarf )

As I mentioned sidethread, "dwarves" is a natural extension of what happens with other common English words ending in f, making it difficult to argue that it is somehow incorrect.

Re:The dwarfs of our vocabulary by jfk13 on Wednesday August 16, 2017 @03:56AM (#15025715)
> etymonline points out that the form with a better-in-some-sense claim to be "correct" is dwarrows, not "dwarfs". But that term was uncommon enough that it completely died out.

This form appears in LOTR in "Dwarrowdelf", given as the translation of the Dwarvish name "Khazad-dûm" of Moria. https://en.wikipedia.org/wiki/Moria_(Middle-earth)

Re:The dwarfs of our vocabulary by ghaff on Tuesday August 15, 2017 @06:02PM (#15023107)
You can look at ngrams. It's much lower pre-Tolkein but "dwarves" exists:

https://books.google.com/ngrams/graph?content=dwarves&year_s...

Dwarvish is a more unusual world and it doesn't surprise me that's almost exclusively tied to Tolkien and derivatives.

Re:The dwarfs of our vocabulary by frubar on Wednesday August 16, 2017 @08:23AM (#15026880)
That could just as easily be interpreted that he's stuck with this spelling mistake (as he said in the other quote) and now asks us to play along ("that's, uh, just how they talked!").