| frigorific | (adjective) causing cold; cooling or chilling | - |
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| intertrigo | (noun) chafing between two skin surfaces that are in contact (as in the armpit or under the breasts or between the thighs) | - |
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| marigold | (noun) any of various tropical American plants of the genus Tagetes widely cultivated for their showy yellow or orange flowers | - |
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| perigon | (noun) an angle of 360 degrees | Synonyms: round angle |
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| perigonal | (adjective) of or relating to a perigone | - |
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| perigone | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigonium |
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| perigonium | (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: chlamys, floral envelope, perianth, perigone |
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| prurigo | (noun) chronic inflammatory disease of the skin characterized by blister capped papules and intense itching | - |
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| rigor | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) the quality of being valid and rigorous | Synonyms: cogency, rigour, validity |
| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigorousness, rigour, rigourousness, severeness, severity, stiffness |
| rigorous | (adjective) demanding strict attention to rules and procedures | Synonyms: stringent, tight |
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| (adjective) rigidly accurate; allowing no deviation from a standard | Synonyms: strict |
| rigorously | (adverb) in a rigorous manner | Synonyms: strictly |
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| rigorousness | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigor, rigour, rigourousness, severeness, severity |
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| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigor, rigour, rigourousness, severeness, severity, stiffness |
| rigour | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigor, rigorousness, rigourousness, severeness, severity |
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| (noun) the quality of being valid and rigorous | Synonyms: cogency, rigor, validity |
| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigor, rigorousness, rigourousness, severeness, severity, stiffness |
| rigourousness | (noun) something hard to endure | Synonyms: asperity, grimness, hardship, rigor, rigorousness, rigour, severeness, severity |
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| (noun) excessive sternness | Synonyms: hardness, harshness, inclemency, rigor, rigorousness, rigour, severeness, severity, stiffness |
| rigout | (noun) a person's costume (especially if bizarre) | - |
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| trigon | (noun) a triangular lyre of ancient Greece and Rome | - |
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| (noun) (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees | Synonyms: triplicity |
| (noun) a three-sided polygon | Synonyms: triangle, trilateral |
| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
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| trigonometric | (adjective) of or relating to or according to the principles of trigonometry | - |
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| trigonometrician | (noun) a mathematician specializing in trigonometry | - |
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| trigonometry | (noun) the mathematics of triangles and trigonometric functions | Synonyms: trig |
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