| pennate | (adjective) having feathered wings | - |
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| penne | (noun) pasta in short tubes with diagonally cut ends | - |
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| penni | (noun) 100 pennia formerly equaled 1 markka in Finland | - |
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| penniless | (adjective) not having enough money to pay for necessities | Synonyms: hard up, impecunious, in straitened circumstances, penurious, pinched |
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| pennilessness | (noun) a state of lacking money | Synonyms: impecuniousness, penuriousness |
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| penning | (noun) the act of creating written works | Synonyms: authorship, composition, writing |
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| pennon | (noun) wing of a bird | Synonyms: pinion |
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| (noun) a long flag; often tapering | Synonyms: pennant, streamer, waft |
| pennoncel | (noun) a small pennant borne on a lance | Synonyms: pennoncelle, penoncel |
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| pennoncelle | (noun) a small pennant borne on a lance | Synonyms: pennoncel, penoncel |
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| penny | (noun) a coin worth one-hundredth of the value of the basic unit | Synonyms: cent, centime |
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| (noun) a fractional monetary unit of Ireland and the United Kingdom; equal to one hundredth of a pound | - |
| pennycress | (noun) any of several plants of the genus Thlaspi | - |
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| pennyroyal | (noun) Eurasian perennial mint have small lilac-blue flowers and ovate leaves; yields an aromatic oil | Synonyms: Mentha pulegium |
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| (noun) erect hairy branching American herb having purple-blue flowers; yields an essential oil used as an insect repellent and sometimes in folk medicine | Synonyms: American pennyroyal, Hedeoma pulegioides |
| pennyweight | (noun) a unit of apothecary weight equal to 24 grains | - |
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| pennywhistle | (noun) an inexpensive fipple flute | Synonyms: tin whistle, whistle |
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| pennyworth | (noun) the amount that can be bought for a penny | Synonyms: penn'orth |
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| penoche | (noun) fudge made with brown sugar and butter and milk and nuts | Synonyms: panocha, panoche, penuche |
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| penologist | (noun) a person who studies the theory and practice of prison management | - |
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| penology | (noun) the branch of criminology concerned with prison management and prisoner rehabilitation | Synonyms: poenology |
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| penoncel | (noun) a small pennant borne on a lance | Synonyms: pennoncel, pennoncelle |
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| penpusher | (noun) a clerk who does boring paperwork | Synonyms: pencil pusher |
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| pension | (noun) a regular payment to a person that is intended to allow them to subsist without working | - |
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| (verb) grant a pension to | Synonyms: pension off |
| pensionable | (adjective) entitled to receive a pension | - |
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| pensionary | (noun) a person who works only for money | Synonyms: hireling |
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| (noun) the beneficiary of a pension fund | Synonyms: pensioner |
| pensioner | (noun) the beneficiary of a pension fund | Synonyms: pensionary |
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| pensive | (adjective) showing pensive sadness | Synonyms: wistful |
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| (adjective) deeply or seriously thoughtful | Synonyms: brooding, broody, contemplative, meditative, musing, pondering, reflective, ruminative |
| pensively | (adverb) in a pensive manner | - |
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| pensiveness | (noun) deep serious thoughtfulness | Synonyms: contemplativeness, meditativeness |
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| (noun) persistent morbid meditation on a problem | Synonyms: brooding |
| penstock | (noun) conduit that carries a rapid flow of water controlled by a sluicegate | Synonyms: sluice, sluiceway |
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| (noun) regulator consisting of a valve or gate that controls the rate of water flow through a sluice | Synonyms: floodgate, head gate, sluice valve, sluicegate, water gate |
| pent | (adjective) closely confined | Synonyms: shut up |
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| pentacle | (noun) a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon | Synonyms: pentagram, pentangle |
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| pentad | (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, Phoebe, quint, quintet, quintuplet, V |
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| pentaerythritol | (noun) a coronary vasodilator (trade name Peritrate) used to treat angina pectoris | Synonyms: Peritrate |
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| pentagon | (noun) a five-sided polygon | - |
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| pentagonal | (adjective) of or relating to or shaped like a pentagon | Synonyms: pentangular |
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| pentagram | (noun) a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon | Synonyms: pentacle, pentangle |
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| pentahedron | (noun) any polyhedron having five plane faces | - |
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| pentail | (noun) brown tree shrew having a naked tail bilaterally fringed with long stiff hairs on the distal third; of Malaysia | Synonyms: pen-tail, pen-tailed tree shrew |
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| pentamerous | (adjective) divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members | - |
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| pentameter | (noun) a verse line having five metrical feet | - |
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| pentamethylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentylenetetrazol |
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| pentangle | (noun) a star with 5 points; formed by 5 straight lines between the vertices of a pentagon and enclosing another pentagon | Synonyms: pentacle, pentagram |
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| pentangular | (adjective) of or relating to or shaped like a pentagon | Synonyms: pentagonal |
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| pentastomid | (noun) wormlike arthropod having two pairs of hooks at the sides of the mouth; parasitic in nasal sinuses of mammals | Synonyms: tongue worm |
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| pentasyllabic | (adjective) having or characterized by or consisting of five syllables | - |
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| pentathlete | (noun) an athlete who competes in a pentathlon | - |
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| pentathlon | (noun) an athletic contest consisting of five different events | - |
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| pentatone | (noun) a gapped scale with five notes; usually the fourth and seventh notes of the diatonic scale are omitted | Synonyms: pentatonic scale |
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| pentatonic | (adjective) relating to a pentatonic scale | - |
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| pentavalent | (adjective) having a valence of five | - |
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| pentazocine | (noun) analgesic drug (trade name Talwin) that is less addictive than morphine | Synonyms: Talwin |
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| pentecostal | (adjective) of or relating to or occurring at Pentecost | - |
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| (adjective) of or relating to or characteristic of any of various Pentecostal religious bodies or their members | - |
| pentecostalism | (noun) the principles and practices of Pentecostal religious groups; characterized by religious excitement and talking in tongues | - |
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| penthouse | (noun) an apartment located on the top floors of a building | - |
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| pentimento | (noun) the reappearance in a painting of an underlying image that had been painted over (usually when the later painting becomes transparent with age) | - |
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| pentlandite | (noun) a mineral (iron and nickel sulphide) that is the chief ore of nickel | - |
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| pentobarbital | (noun) a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic | Synonyms: Nembutal, pentobarbital sodium, yellow jacket |
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| pentode | (noun) a thermionic tube having five electrodes | - |
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| pentose | (noun) any monosaccharide sugar containing five atoms of carbon per molecule | - |
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| pentoxide | (noun) an oxide containing five atoms of oxygen in the molecule | - |
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| pentoxifylline | (noun) a drug (trade name Trental) used to treat claudication; believed to increase the flexibility of red blood cells so they can flow through the blood vessels to the legs and feet | Synonyms: Trental |
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| pentylenetetrazol | (noun) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark | Synonyms: Metrazol, pentamethylenetetrazol |
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| penuche | (noun) fudge made with brown sugar and butter and milk and nuts | Synonyms: panocha, panoche, penoche |
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| penuchle | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: bezique, pinochle, pinocle |
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| penult | (noun) the next to last syllable in a word | Synonyms: penultima, penultimate |
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| penultima | (noun) the next to last syllable in a word | Synonyms: penult, penultimate |
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| penultimate | (adjective) second last | Synonyms: next-to-last |
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| (noun) the next to last syllable in a word | Synonyms: penult, penultima |
| penumbra | (noun) a fringe region of partial shadow around an umbra | - |
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| penumbral | (adjective) of or pertaining to the region of partial shadow around an umbra | - |
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| penurious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, impecunious, in straitened circumstances, penniless, pinched |
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| (adjective) excessively unwilling to spend | Synonyms: parsimonious |
| penuriously | (adverb) in a penurious manner | - |
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| penuriousness | (noun) a disposition to be niggardly with money | - |
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| (noun) a state of lacking money | Synonyms: impecuniousness, pennilessness |
| penury | (noun) a state of extreme poverty or destitution | Synonyms: indigence, need, pauperism, pauperization |
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| perpendicular | (adjective) intersecting at or forming right angles | - |
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| (adjective) at right angles to the plane of the horizon or a base line | Synonyms: vertical |
| (adjective) so steep as to be nearly vertical | - |
| (noun) an extremely steep face | - |
| (noun) a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point | Synonyms: plumb line |
| (noun) a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting | Synonyms: English-Gothic, English-Gothic architecture, perpendicular style |
| (noun) a straight line at right angles to another line | - |
| perpendicularity | (noun) the quality of being at right angles to a given line or plane (especially the plane of the horizon) | - |
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| (noun) the relation of opposition between things at right angles | Synonyms: orthogonal opposition, orthogonality |
| perpendicularly | (adverb) in a perpendicular manner | - |
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| (adverb) straight up or down without a break | Synonyms: sheer |
| pigpen | (noun) a pen for swine | Synonyms: pigsty, sty |
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| playpen | (noun) a portable enclosure in which babies may be left to play | Synonyms: pen |
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| polypropene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropylene |
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| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
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| propenal | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: acrolein |
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| propene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propylene |
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| propenoate | (noun) a salt or ester of propenoic acid | Synonyms: acrylate |
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| propenonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: acrylonitrile, vinyl cyanide |
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| propensity | (noun) a disposition to behave in a certain way | Synonyms: aptness |
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| (noun) a natural inclination | Synonyms: leaning, proclivity |
| (noun) an inclination to do something | Synonyms: leaning, tendency |
| recompense | (noun) the act of compensating for service or loss or injury | Synonyms: compensation |
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| (noun) payment or reward (as for service rendered) | - |
| (verb) make payment to; compensate | Synonyms: compensate, remunerate |
| (verb) make amends for; pay compensation for | Synonyms: compensate, indemnify, repair |
| reopen | (verb) open again or anew | - |
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| repent | (verb) feel remorse for; feel sorry for; be contrite about | Synonyms: regret, rue |
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| (verb) turn away from sin or do penitence | Synonyms: atone |
| repentance | (noun) remorse for your past conduct | Synonyms: penance, penitence |
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| repentant | (adjective) feeling or expressing remorse for misdeeds | Synonyms: penitent |
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| repentantly | (adverb) showing remorse | Synonyms: penitentially, penitently |
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| resuspend | (verb) put back into suspension | - |
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| resuspension | (noun) a renewed suspension of insoluble particles after they have been precipitated | - |
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| ripen | (verb) grow ripe | - |
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| (verb) cause to ripen or develop fully | Synonyms: mature |
| ripened | (adjective) of wines, fruit, cheeses; having reached a desired or final condition; (`aged' pronounced as one syllable) | Synonyms: aged |
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| ripeness | (noun) the state of being ripe | - |
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| ripening | (noun) coming to full development; becoming mature | Synonyms: maturation, maturement |
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| (noun) acquiring desirable qualities by being left undisturbed for some time | Synonyms: ageing, aging |
| sangapenum | (noun) a variety of gum | Synonyms: gum sangapenum |
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| scolopendrium | (noun) a fern thought to resemble a millipede | - |
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| serpent | (noun) limbless scaly elongate reptile; some are venomous | Synonyms: ophidian, snake |
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| (noun) an obsolete bass cornet; resembles a snake | - |
| (noun) a firework that moves in serpentine manner when ignited | - |
| serpentine | (adjective) resembling a serpent in form | Synonyms: snakelike, snaky |
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