| pet | (noun) a domesticated animal kept for companionship or amusement | - |
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| (noun) a fit of petulance or sulkiness (especially at what is felt to be a slight) | - |
| (noun) a special loved one | Synonyms: darling, dearie, deary, ducky, favorite, favourite |
| petabit | (noun) a unit of information equal to 1000 terabits or 10^15 bits | Synonyms: Pb, Pbit |
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| petabyte | (noun) a unit of information equal to 1024 tebibytes or 2^50 bytes | Synonyms: PB, pebibyte, PiB |
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| (noun) a unit of information equal to 1000 terabytes or 10^15 bytes | Synonyms: PB |
| petaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one quadrillion floating-point operations a second. | Synonyms: PFLOPS |
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| petal | (noun) part of the perianth that is usually brightly colored | Synonyms: flower petal |
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| petard | (noun) an explosive device used to break down a gate or wall | - |
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| petchary | (noun) a kingbird that breeds in the southeastern United States and winters in tropical America; similar to but larger than the eastern kingbird | Synonyms: gray kingbird, grey kingbird, Tyrannus domenicensis domenicensis |
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| petcock | (noun) regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining | - |
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| petechia | (noun) a minute red or purple spot on the surface of the skin as the result of tiny hemorrhages of blood vessels in the skin (as in typhoid fever) | - |
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| petfood | (noun) food prepared for animal pets | Synonyms: pet-food, pet food |
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| petiole | (noun) the slender stem that supports the blade of a leaf | Synonyms: leafstalk |
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| petiolule | (noun) the stalk of a leaflet | - |
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| petite | (noun) a garment size for short or slender women | - |
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| petiteness | (noun) the property of being very small in size | Synonyms: diminutiveness, minuteness, tininess, weeness |
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| petitio | (noun) the logical fallacy of assuming the conclusion in the premises; begging the question | Synonyms: petitio principii |
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| petition | (noun) a formal message requesting something that is submitted to an authority | Synonyms: postulation, request |
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| (noun) reverent petition to a deity | Synonyms: orison, prayer |
| petitioner | (noun) one praying humbly for something | Synonyms: requester, suppliant, supplicant |
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| (noun) someone who petitions a court for redress of a grievance or recovery of a right | Synonyms: suer |
| petrel | (noun) relatively small long-winged tube-nosed bird that flies far from land | - |
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| petrifaction | (noun) a rock created by petrifaction; an organic object infiltrated with mineral matter and preserved in its original form | - |
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| (noun) the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape | Synonyms: petrification |
| petrification | (noun) the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape | Synonyms: petrifaction |
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| petrissage | (noun) massage of the skin which is gently lifted and squeezed | - |
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| petrochemical | (noun) any compound obtained from petroleum or natural gas | - |
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| petroglyph | (noun) a carving or line drawing on rock (especially one made by prehistoric people) | - |
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| petrol | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, gasoline |
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| petrolatum | (noun) a semisolid mixture of hydrocarbons obtained from petroleum; used in medicinal ointments and for lubrication | Synonyms: mineral jelly, petroleum jelly |
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| petroleum | (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, oil, rock oil |
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| petrology | (noun) the branch of geology that studies rocks: their origin and formation and mineral composition and classification | Synonyms: lithology |
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| petter | (noun) a lover who gently fondles and caresses the loved one | Synonyms: fondler |
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| petticoat | (noun) undergarment worn under a skirt | Synonyms: half-slip, underskirt |
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| pettifogger | (noun) a person (especially a lawyer or politician) who uses unscrupulous or unethical methods | Synonyms: shyster |
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| (noun) a disputant who quibbles; someone who raises annoying petty objections | Synonyms: caviler, caviller, quibbler |
| pettifoggery | (noun) a quarrel about petty points | Synonyms: bicker, bickering, fuss, spat, squabble, tiff |
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| pettiness | (noun) the quality of being unimportant and petty or frivolous | Synonyms: puniness, slightness, triviality |
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| (noun) lack of generosity in trifling matters | Synonyms: littleness, smallness |
| (noun) narrowness of mind or ideas or views | - |
| petting | (noun) affectionate play (or foreplay without contact with the genital organs) | Synonyms: caressing, cuddling, fondling, hugging, kissing, necking, smooching, snuggling |
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| pettishness | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, irritability, peevishness, snappishness, surliness, temper |
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| petty | (noun) larceny of property having a value less than some amount (the amount varies by locale) | Synonyms: petit larceny, petty larceny |
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| petulance | (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, irritability, peevishness |
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| petunia | (noun) any of numerous tropical herbs having fluted funnel-shaped flowers | - |
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