Source : Webster's Revised Unabridged Dictionary (1913)

Syle \Syle\, n. [See {Sile} a young herring.] (Zo["o]l.)
   A young herring ({Clupea harengus}). [Also written {sile}.]

         But our folk call them syle, and nought but syle, And
         when they're grown, why then we call them herring. --J.
                                                  Ingelow.