Relating to Franciscus or Jacobus Sylvius or to any of the structures described by either of them.
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syl·vi·an 'sil-vē-ən adj, often cap S of or relating to the sylvian fissure
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syl·vi·an (silґve-ən) 1. described by or named for Franciscus Sylvius. 2. described by or named for Jacobus Sylvius.Medical dictionary. 2011.