| prism | (noun) optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image | Synonyms: optical prism |
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| (noun) a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms | - |
| prismatoid | (noun) a polyhedron whose vertices all lie in one or the other of two parallel planes; the faces that lie in those planes are the bases of the prismatoid | - |
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| prismoid | (noun) a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms | - |
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| prison | (noun) a correctional institution where persons are confined while on trial or for punishment | Synonyms: prison house |
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| (noun) a prisonlike situation; a place of seeming confinement | Synonyms: prison house |
| prisonbreak | (noun) an escape from jail | Synonyms: break, breakout, gaolbreak, jailbreak, prison-breaking |
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| prisoner | (noun) a person who is confined; especially a prisoner of war | Synonyms: captive |
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