Definition of "trout"

Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold trout-streams, the boards giving back the clatter of our horses' feet: […] .

1897 December (indicated as 1898), Winston Churchill, chapter VIII, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd.

“This morning,” he said, “We will fish, Turner. We will cast for trout so that we may catch grayling.”

1922, Michael Arlen, “3/19/2”, in “Piracy”: A Romantic Chronicle of These Days‎

God bless me! is it possible that you, a tall fellow with a black moustache, can be the curly fair-haired boy I have so often carried on my back and saddle-bow, and taught to make flies of red spinner and drakes’ wings, when we trouted together at Llyn Cwellyn among the hills yonder?

1871 October, James Grant, “Under the Red Dragon”, in Tinsleys’ Magazine, volume IX, chapter III (By Express), pages 251–252

We found not more than three birds in any one place, and many times only one old bird, and this where we knew they had bred, for our pointer Rex found them while we were trouting.

1908 January 18, Ernest M. Gross, “The Ruffed Grouse Scarcity”, in Forest and Stream: A Journal of Outdoor Life, Travel, Nature Study, Shooting, Fishing, Yachting, volume LXX, number 3, New York, N.Y.: Forest and Stream Publishing Co., page 92, column 3

He didn’t want to go out on the water. I wouldn’t say he was afraid of it, because every time he was home he was always out in the boat trouting.

1987, Douglas House, edited by Cle Newhook, But Who Cares Now? The Tragedy of the Ocean Ranger, St. John’s, Nfld.: Breakwater Books, page 36