irrefragable
The Century Dictionary: The Encyelopedic Lexicon of the English Language · 1887 · p. 529
(i-ret’ra-ga-bl), a. [= F. iréfra- gable = Sp. irrefragable = Peg. irrefragavel = It. in ref raga bile, irrefragabile,
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Chamber's Twientieth Century Dictionary (1908)
Chamber's Etymological of the English Language (1895)
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