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.

Source: Webster's Revised Unabridged Dictionary (1913)