A European fish (Thymallus vulgaris), allied to the trout, but having a very broad dorsal fin; -- called also umber. It inhabits cold mountain streams, and is valued as a game fish. [1913 Webster]
An American fish of the genus Thymallus, having similar habits to the above; one species (T. Ontariensis), inhabits several streams in Michigan; another (T. montanus), is found in the Yellowstone region. [1913 Webster]
, n.
1 any silver-grey freshwater fish of the genus Thymallus, with a long high dorsal fin.
2 a butterfly, Hipparchia semele, having wings with grey undersides and bright eye-spots on the upper side.