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The Collaborative International Dictionary
T Ontariensis

Grayling \Gray"ling\, n. [From Gray, a.]

  1. (Zo["o]l.) 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.

    And here and there a lusty trout, And here and there a grayling.
    --Tennyson.

  2. (Zo["o]l.) 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.