a fish related to the salmon, often having distinctive spotted markings
any of several species of food and sport fish that are related to but mostly smaller than the salmon. Many species have distinctive spotted markings: genera Salmo and Salvelinus
old trout
informal an irritating, interfering, or bad-tempered person, esp an old woman
[Old English trūht from Latin tructa a fish with sharp teeth, from Greek trōgein to gnaw]