| pensioner | (noun) the beneficiary of a pension fund | Synonyms: pensionary |
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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 |
| 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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| 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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| 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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| 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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| 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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| pentazocine | (noun) analgesic drug (trade name Talwin) that is less addictive than morphine | Synonyms: Talwin |
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| 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 | (noun) the next to last syllable in a word | Synonyms: penult, penultima |
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| penumbra | (noun) a fringe region of partial shadow around an umbra | - |
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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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| peon | (noun) a laborer who is obliged to do menial work | Synonyms: drudge, galley slave, navvy |
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| peonage | (noun) the practice of making a debtor work for his creditor until the debt is discharged | - |
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| (noun) the condition of a peon | - |
| peony | (noun) any of numerous plants widely cultivated for their showy single or double red or pink or white flowers | Synonyms: paeony |
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| people | (noun) (plural) any group of human beings (men or women or children) collectively | - |
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| (noun) the body of citizens of a state or country | Synonyms: citizenry |
| (noun) members of a family line | - |
| (noun) the common people generally | Synonyms: hoi polloi, mass, masses, multitude, the great unwashed |
| peoples | (noun) the human beings of a particular nation or community or ethnic group | - |
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| pep | (noun) liveliness and energy | Synonyms: ginger, peppiness |
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| peperomia | (noun) any of various plants of the genus Peperomia; grown primarily for their often succulent foliage | - |
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| peplos | (noun) a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist | Synonyms: peplum, peplus |
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| peplum | (noun) a flared ruffle attached to the waistline of a dress or jacket or blouse | - |
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| (noun) a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist | Synonyms: peplos, peplus |
| peplus | (noun) a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist | Synonyms: peplos, peplum |
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| pepper | (noun) pungent seasoning from the berry of the common pepper plant of East India; use whole or ground | Synonyms: peppercorn |
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| (noun) sweet and hot varieties of fruits of plants of the genus Capsicum | - |
| (noun) any of various tropical plants of the genus Capsicum bearing peppers | Synonyms: capsicum, capsicum pepper plant |
| (noun) climber having dark red berries (peppercorns) when fully ripe; southern India and Sri Lanka; naturalized in northern Burma and Assam | Synonyms: black pepper, common pepper, Madagascar pepper, Piper nigrum, white pepper |
| peppercorn | (noun) pungent seasoning from the berry of the common pepper plant of East India; use whole or ground | Synonyms: pepper |
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| pepperidge | (noun) columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall | Synonyms: black gum, Nyssa sylvatica, sour gum |
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| pepperiness | (noun) a hot spiciness | Synonyms: hotness |
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| peppermint | (noun) a candy flavored with peppermint oil | Synonyms: peppermint candy |
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| (noun) herb with downy leaves and small purple or white flowers that yields a pungent oil used as a flavoring | Synonyms: Mentha piperita |
| (noun) red gum tree of Tasmania | Synonyms: Eucalyptus amygdalina, peppermint gum, red gum |
| pepperoni | (noun) a pork and beef sausage (or a thin slice of this sausage) | - |
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| pepperwood | (noun) Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood | Synonyms: California bay tree, California laurel, California olive, mountain laurel, Oregon myrtle, sassafras laurel, spice tree, Umbellularia californica |
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| pepperwort | (noun) annual herb used as salad green and garnish | Synonyms: common garden cress, garden pepper cress, Lepidium sativum, pepper grass |
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| (noun) any of several water ferns of the genus Marsilea having four leaflets | Synonyms: clover fern |
| peppiness | (noun) liveliness and energy | Synonyms: ginger, pep |
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| pepsin | (noun) an enzyme produced in the stomach that splits proteins into peptones | - |
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| pepsinogen | (noun) precursor of pepsin; stored in the stomach walls and converted to pepsin by hydrochloric acid in the stomach | - |
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| peptidase | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: protease, proteinase, proteolytic enzyme |
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| peptide | (noun) amide combining the amino group of one amino acid with the carboxyl group of another; usually obtained by partial hydrolysis of protein | - |
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| peptisation | (noun) the process of converting to a sol; bringing to a colloidal solution | Synonyms: peptization |
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| peptization | (noun) the process of converting to a sol; bringing to a colloidal solution | Synonyms: peptisation |
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| peptone | (noun) any of various water-soluble compounds that form by hydrolysis in the digestion of proteins to amino acids | - |
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| peradventure | (noun) doubt or uncertainty as to whether something is the case | - |
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| perambulation | (noun) a leisurely walk (usually in some public place) | Synonyms: amble, promenade, saunter, stroll |
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| (noun) a walk around a territory (a parish or manor or forest etc.) in order to officially assert and record its boundaries | - |
| perambulator | (noun) a small vehicle with four wheels in which a baby or child is pushed around | Synonyms: baby buggy, baby carriage, carriage, go-cart, pram, pushchair, pusher, stroller |
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| percale | (noun) a fine closely woven cotton fabric | - |
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| perceiver | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, percipient |
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| percent | (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percentage |
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| percentage | (noun) assets belonging to or due to or contributed by an individual person or group | Synonyms: part, portion, share |
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| (noun) a proportion in relation to a whole (which is usually the amount per hundred); ten percent | Synonyms: pct, per centum, percent |
| percentile | (noun) (statistics) any of the 99 numbered points that divide an ordered set of scores into 100 parts each of which contains one-hundredth of the total | Synonyms: centile |
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| percept | (noun) the representation of what is perceived; basic component in the formation of a concept | Synonyms: perception, perceptual experience |
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| perceptibility | (noun) the property of being perceptible by the mind or the senses | - |
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| perception | (noun) becoming aware of something via the senses | Synonyms: sensing |
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| (noun) the process of perceiving | - |
| (noun) the representation of what is perceived; basic component in the formation of a concept | Synonyms: percept, perceptual experience |
| (noun) a way of conceiving something | - |
| (noun) knowledge gained by perceiving | - |
| perceptiveness | (noun) the quality of insight and sympathetic understanding | - |
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| (noun) delicate discrimination (especially of esthetic values) | Synonyms: appreciation, discernment, taste |
| (noun) perception of that which is obscure | Synonyms: discernment |
| (noun) a feeling of understanding | Synonyms: insight, perceptivity |
| perceptivity | (noun) a feeling of understanding | Synonyms: insight, perceptiveness |
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| perceptuality | (noun) The quality of being related to the organization, identification, and interpretation of sensory information. | - |
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| perch | (noun) spiny-finned freshwater food and game fishes | - |
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| (noun) any of numerous spiny-finned fishes of various families of the order Perciformes | - |
| (noun) support consisting of a branch or rod that serves as a resting place (especially for a bird) | - |
| (noun) any of numerous fishes of America and Europe | - |
| (noun) an elevated place serving as a seat | - |
| (noun) a linear measure of 16.5 feet | Synonyms: pole, rod |
| (noun) a square rod of land | Synonyms: pole, rod |
| percher | (noun) a bird with feet adapted for perching (as on tree branches); this order is now generally abandoned by taxonomists | Synonyms: Insessores, order Insessores, perching bird |
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| (noun) a person situated on a perch | - |
| perchlorate | (noun) a salt of perchloric acid | - |
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| perchloride | (noun) a chloride containing an unusually high proportion of chlorine | - |
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| perchloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, tetrachloromethane |
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| percipient | (noun) a person who becomes aware (of things or events) through the senses | Synonyms: beholder, observer, perceiver |
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| percoid | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid fish, percoidean |
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| percoidean | (noun) any of numerous spiny-finned fishes of the order Perciformes | Synonyms: percoid, percoid fish |
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| percolate | (noun) the product of percolation | - |
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| percolation | (noun) the act of making coffee in a percolator | - |
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| (noun) the filtration of a liquid for extraction or purification | - |
| (noun) the slow passage of a liquid through a filtering medium | Synonyms: infiltration |
| percolator | (noun) a coffeepot in which boiling water ascends through a central tube and filters back down through a basket of ground coffee beans | - |
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| percussion | (noun) the act of exploding a percussion cap | - |
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| (noun) the act of playing a percussion instrument | - |
| (noun) tapping a part of the body for diagnostic purposes | Synonyms: pleximetry |
| (noun) the section of a band or orchestra that plays percussion instruments | Synonyms: percussion section, rhythm section |
| percussionist | (noun) a musician who plays percussion instruments | - |
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| percussor | (noun) (medicine) a small hammer with a rubber head used in percussive examinations of the chest and in testing reflexes | Synonyms: plessor, plexor |
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| perdition | (noun) (Christianity) the abode of Satan and the forces of evil; where sinners suffer eternal punishment | Synonyms: Hell, infernal region, Inferno, nether region, pit |
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| perdurability | (noun) the property of being extremely durable | - |
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| peregrination | (noun) traveling or wandering around | - |
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| peregrine | (noun) a widely distributed falcon formerly used in falconry | Synonyms: Falco peregrinus, peregrine falcon |
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| perennation | (noun) the process of living through a number of years (as a perennial plant) | - |
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| perennial | (noun) (botany) a plant lasting for three seasons or more | - |
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| perestroika | (noun) an economic policy adopted in the former Soviet Union; intended to increase automation and labor efficiency but it led eventually to the end of central planning in the Russian economy | - |
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| perfect | (noun) a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect) | Synonyms: perfect tense, perfective, perfective tense |
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| perfecta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: exacta |
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| perfecter | (noun) a skilled worker who perfects something | - |
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