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Anyone know of a good offline version for linux? (besides just searching within an ebook copy)

There is one linked in the article. Stardict format; any reasonable dictionary software will read it.

That appears to be a 2007 copy of Websters? I'm looking for Chambers. Seems that there isn't an ebook of it, just phone apps.

Discovered that their 13th edition accidently left out ~500 words: