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at-

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  1. variant of ad- before t: attend.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for at-

assimilated form of ad- "to, toward, before" before stems beginning in -t-; see ad-.

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Online Etymology Dictionary, © 2010 Douglas Harper

at- in Medicine

at-

pref.
  1. Variant ofad-