D defs.my
Entry 2 senses Webster, 1913

Grayling

/grāl'-ĭng/ · Gray·ling · IPA /ɡrˈeɪlɪŋ/
01 n. A European fish (Thymallus vulgaris), allied to the trout, but having a very broad dorsal fin; -- called also umber. It inhabits cold moun…
  1. 1.
    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.(Zool.) Also: umber
    “And here and there a lusty trout, And here and there a grayling.” Tennyson.
  2. 2.
    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.(Zool.)