slide
US /slaɪd/
UK /slaɪd/

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a small piece of glass on which specimens are mounted for examination with a microscope
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The scientist prepared a blood sample on a glass slide.
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View the bacteria under the microscope using this slide.
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a photographic transparency mounted in a frame for projection
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The professor showed a series of historical maps as slides during his lecture.
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We watched old family slides on the projector.
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pass gradually to a worse or lower condition
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His grades began to slide after he stopped studying.
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The economy continued to slide into recession.