A close observer; someone who looks at something (such as an exhibition of some kind). Synonyms:looker, spectator, watcher, witness."Television viewers" , "Sky watchers discovered a new star"
2.
An optical device for viewing photographic transparencies.
... know just what dreams to use in order to break him? Or did he himself furnish the actors and the action, projecting old terrors in this mist as a tri-dee tape projected a story in three dimensions for the amusement of the viewer? ... — Storm Over Warlock • Andre Norton
... coordinates are not exact. It will be a few years before we're able to look at a log and locate within ten feet of where a ship has been." The doctor spread out a large photomap. There were several marks on it. He fastened a stereoscope viewer over Bolden's eyes and handed him a pencil. "Can you ... — Bolden's Pets • F. L. Wallace
... pitch. It never occurred to him to doubt whether this letter might not be a hoax. For many years he had known Simon Ford, one of the former foremen of the Aberfoyle mines, of which he, James Starr, had for twenty years, been the manager, or, as he would be termed in English coal-mines, the viewer. James Starr was a strongly-constituted man, on whom his fifty-five years weighed no more heavily than if they had been forty. He belonged to an old Edinburgh family, and was one of its most distinguished members. His labors did credit to the body of engineers who are gradually devouring the carboniferous ... — The Underground City • Jules Verne
... in the library, sipping a brandy and pretending to scan a Congressional Record in the viewer-box. He looked up, bird-like, as Dan Fowler strode in. "Well, Nate. Sit down, sit down. I see you're into my private stock already, so I won't offer you any. What's this about ... — Martyr • Alan Edward Nourse