| pyrocellulose | (noun) nitrocellulose containing less nitrogen than guncotton; used in making smokeless powder | - |
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| pyrochemistry | (noun) processes for chemical reactions at high temperatures | Synonyms: pyrochemical process |
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| pyroelectricity | (noun) generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature | - |
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| pyrogallol | (noun) a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer | Synonyms: pyrogallic acid |
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| pyrogen | (noun) any substance that can cause a rise in body temperature | Synonyms: pyrectic |
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| (noun) any substance characterized by its great flammability | - |
| pyrograph | (noun) a design produced by pyrography | - |
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| pyrographer | (noun) an artist who practices pyrography | - |
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| pyrography | (noun) the act of producing drawings on wood or leather by using heated tools or a fine flame | - |
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| pyrola | (noun) any of several evergreen perennials of the genus Pyrola | Synonyms: wintergreen |
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| pyrolatry | (noun) the worship of fire | Synonyms: fire-worship |
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| pyrolusite | (noun) a mineral consisting of manganese dioxide; an important source of manganese | - |
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| pyrolysis | (noun) transformation of a substance produced by the action of heat | - |
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| pyromancer | (noun) one who practices pyromancy | - |
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| pyromancy | (noun) divination by fire or flames | - |
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| pyromania | (noun) an uncontrollable desire to set fire to things | - |
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| pyromaniac | (noun) a person with a mania for setting things on fire | - |
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| pyrometer | (noun) a thermometer designed to measure high temperatures | - |
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| pyromorphite | (noun) a mineral consisting of lead chloride and phosphate; a minor source of lead | Synonyms: green lead ore |
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| pyrope | (noun) a deep red garnet used as a gemstone | - |
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| pyrophobia | (noun) a morbid fear of fire | - |
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| pyrophosphate | (noun) a salt or ester of pyrophosphoric acid | - |
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| pyrophyllite | (noun) a white or greenish aluminum silicate mineral (resembles talc) | - |
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| pyroscope | (noun) a pyrometer that uses the color of the light emitted by a hot object | Synonyms: optical pyrometer |
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| pyrosis | (noun) a painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder | Synonyms: heartburn |
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| pyrostat | (noun) a thermostat that operates at very high temperatures | - |
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| pyrotechnic | (noun) (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc. | Synonyms: firework |
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| pyrotechnics | (noun) the craft of making fireworks | Synonyms: pyrotechny |
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| (noun) (music) brilliance of display (as in the performance of music) | - |
| pyrotechny | (noun) the craft of making fireworks | Synonyms: pyrotechnics |
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| pyroxene | (noun) any of a group of crystalline silicate mineral common in igneous and metamorphic rocks | - |
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| pyroxylin | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxyline |
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| pyroxyline | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxylin |
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