What does "eelpout" mean?

Eelpout: (a) A European fish (Zoarces viviparus), remarkable for producing living young; -- called also greenbone, guffer, bard, and Maroona eel. Also, an American species (Z. anguillaris), -- called also mutton fish, and, erroneously, congo eel, ling, and lamper eel. Both are edible, but of little value. (b) A fresh-water fish, the burbot.