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cover glass

n. a small and very thing piece of glass used to cover the specimen on a microscope slide [syn: cover slip]

Usage examples of "cover glass".

She smeared a cover glass over a drop of fluid on a slide and set it to dry.

Behind them, with staggering sound and visual effects, Martian colonists were battening hatches and shoveling Marsdust to cover glass walls.

Then I drew a breath before I scrabbled under and past the protruding edge of the cover glass to stand on the roof.