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prism (prizīәm)   a solid of glass, plastic, or a similar substance with a triangular or polygonal cross section, which splits up a ray of light into its constituent colors and turns or deflects light rays toward its base. Prisms are used to correct deviations of the eyes, since they alter the apparent situation of objects.
 

adamantine prisms  , enamel prisms  the structural units of the tooth enamel, consisting of parallel rods or prisms composed mainly of hydroxyapatite crystals and organic substance.





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