grayling noun 11forms 1 noun11 •Any freshwater fish of the genus Thymallus or specifically Thymallus thymallus, of the salmon family, having a large dorsal fin.“This morning,” he said, “We will fish, Turner. We will cast for trout so that we may catch grayling.” — 1922 •Other similar fish •Thymallus arcticus (Arctic grayling) •Salmo salar (Atlantic salmon) •Prototroctes spp. (Retropinnidae) •Prototroctes maraena (Australian grayling) •Prototroctes oxyrhynchus (New Zealand grayling) •Any member of the species Hipparchia semele, of the family Nymphalidae of butterflies. •Other butterflies of genus Hipparchia. •Some butterflies of the genus Oeneis. •A common wood-nymph, a nymphalid butterfly (Cercyonis pegala). formsgraylings