Source : Webster's Revised Unabridged Dictionary (1913)

Redfin \Red"fin`\ (-f?n`), n. (Zo["o]l.)
   A small North American dace ({Minnilus cornutus}, or
   {Notropis megalops}). The male, in the breeding season, has
   bright red fins. Called also {red dace}, and {shiner}.
   Applied also to {Notropis ardens}, of the Mississippi valley.