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nonword

[non-wurd]
noun
  1. a word that is not recognized or accepted as legitimate, as one produced by a spelling or typographical error.
  2. a word whose meaning or use is not approved in a given circumstance: “Failure” is a nonword in her vocabulary.
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Origin of nonword

First recorded in 1960–65; non- + word
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018