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circumfix

[sur-kuh m-fiks]Grammar
noun
  1. a prefix and a suffix attached to a root or stem, as the a and -ing in a-going.
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verb (used with object)
  1. to add a circumfix to.
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Related formscir·cum·fix·a·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018