Salvelinus namaycush sal·ve·li·nusnamaycush uncommon noun 1. large fork-tailed trout of lakes of Canada and the northern United States Synonymslake troutsalmon troutSalvelinus namaycush Related words Broader terms trout Parts Salvelinus Part of lake trout WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.