from
The Collaborative International Dictionary of English v.0.48
Grayling \Gray"ling\, n. [From {Gray}, a.]
1. (Zool.) 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]
And here and there a lusty trout,
And here and there a grayling. --Tennyson.
[1913 Webster]
2. (Zool.) 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]