n. ~ 1. Photography · A positive photographic image on transparent film that has been mounted to facilitate projection. - 2. Science · A piece of glass used to hold a specimen for viewing under a microscope.
Slide1 connotes a 35 mm transparency in a 2 × 2 inch mount designed for use in a projector, although the term is used to describe similar formats in other sizes. A super slide is made from a larger size film, also mounted in a 2 × 2 inch mount, but with greater ratio of image-to-mount area.