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.

Source: Webster's Revised Unabridged Dictionary (1913)