Source : Webster's Revised Unabridged Dictionary (1913)

Merlin \Mer"lin\, n. [OE. merlion, F. ['e]merillon; cf. OHG.
   smirl, G. schmerl; prob. fr. L. merula blackbird. Cf.
   {Merle}.] (Zo["o]l.)
   A small European falcon ({Falco lithofalco}, or {F.
   [ae]salon}).