prism is a topic covered in the Taber's Medical Dictionary.

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(prĭzm )

[Gr. prisma]
A transparent solid, three sides of which are parallelograms. The bases, perpendicular to the three sides, are triangles, and a transverse section of the solid is a triangle. Light rays going through a prism are deflected toward the base of the triangle and at the same time are split into the primary colors.

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