'T Ontariensis' definitions:

Definition of 'T Ontariensis'

From: GCIDE

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]