|1.||a transparent polygonal solid, often having triangular ends and rectangular sides, for dispersing light into a spectrum or for reflecting and deviating light. They are used in spectroscopes, binoculars, periscopes, etc|
|2.||a form of crystal with faces parallel to the vertical axis|
|3.||maths a polyhedron having parallel, polygonal, and congruent bases and sides that are parallelograms|
|[C16: from Medieval Latin prisma, from Greek: something shaped by sawing, from prizein to saw]|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
A solid figure whose bases or ends have the same size and shape and are parallel to one another, and each of whose sides is a parallelogram.
A transparent body of this form, often of glass and usually with triangular ends, used for separating white light passed through it into a spectrum or for reflecting beams of light.
Such a body used in testing or correcting imbalance of the extrinsic ocular muscles.
|prism (prĭz'əm) Pronunciation Key
A solid figure in geometry with bases or ends of the same size and shape and sides that have parallel edges. Also, an object that has this shape.
Note: A prism of glass (or a similar transparent material) can be used to bend different wavelengths of light by different amounts through refraction. This bending separates a beam of white light into a spectrum of colored light.