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English definition of “slide”

slide

noun [C] (PHOTOGRAPH)   /slɑɪd/
a small piece of film in a frame which, when light is passed through it, shows a photograph on a screen: The art history professor showed us slides of the Parthenon today. science In scientific study, a slide is a small piece of glass on which you put something in order to look at it through a microscope (= device that makes small objects look larger) and see its structure.
(Definition of slide noun (PHOTOGRAPH) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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