The Collaborative International Dictionary of English v.0.48:
Gunnel \Gun"nel\, n. [See Gunwale.] 1. A gunwale. [1913 Webster] 2. (Zool.) A small, eel-shaped, marine fish of the genus Mur[ae]noides; esp., M. gunnellus of Europe and America; -- called also gunnel fish, butterfish, rock eel. [1913 Webster]