| orthodontia | (noun) the branch of dentistry dealing with the prevention or correction of irregularities of the teeth | Synonyms: dental orthopaedics, dental orthopedics, orthodontics, orthodonture |
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| osteomalacia | (noun) abnormal softening of bones caused by deficiencies of phosphorus or calcium or vitamin D | - |
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| otalgia | (noun) an ache localized in the middle or inner ear | Synonyms: earache |
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| oxyopia | (noun) unusually acute vision | - |
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| pachycheilia | (noun) an abnormal thickness of the lips | - |
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| paedophilia | (noun) a sexual attraction to children | Synonyms: pedophilia |
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| palilalia | (noun) a pathological condition in which a word is rapidly and involuntarily repeated | - |
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| pancytopenia | (noun) an abnormal deficiency in all blood cells (red blood cells and white blood cells and platelets); usually associated with bone marrow tumor or with aplastic anemia | - |
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| panspermia | (noun) The hypothesis that microorganisms may transmit life from outer space to habitable bodies; or the process of such transmission. | - |
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| papaia | (noun) tropical American shrub or small tree having huge deeply palmately cleft leaves and large oblong yellow fruit | Synonyms: Carica papaya, melon tree, papaya, papaya tree, pawpaw |
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| paraesthesia | (noun) abnormal skin sensations (as tingling or tickling or itching or burning) usually associated with peripheral nerve damage | Synonyms: paresthesia |
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| paramecia | (noun) any member of the genus Paramecium | Synonyms: paramecium |
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| paramnesia | (noun) (psychiatry) a disorder of memory in which dreams or fantasies are confused with reality | - |
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| paranoia | (noun) a psychological disorder characterized by delusions of persecution or grandeur | - |
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| paraphernalia | (noun) equipment consisting of miscellaneous articles needed for a particular operation or sport etc. | Synonyms: appurtenance, gear |
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| paraphilia | (noun) abnormal sexual activity | - |
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| paraphrenia | (noun) a form of schizophrenia characterized by delusions (of persecution or grandeur or jealousy); symptoms may include anger and anxiety and aloofness and doubts about gender identity; unlike other types of schizophrenia the patients are usually presentable and (if delusions are not acted on) may function in an apparently normal manner | Synonyms: paranoic type schizophrenia, paranoid schizophrenia, paraphrenic schizophrenia |
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| paraplegia | (noun) paralysis of the lower half of the body (most often as a result of trauma) | - |
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| parasitaemia | (noun) a condition in which parasites are present in the blood | Synonyms: parasitemia |
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| parasitemia | (noun) a condition in which parasites are present in the blood | Synonyms: parasitaemia |
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| paresthesia | (noun) abnormal skin sensations (as tingling or tickling or itching or burning) usually associated with peripheral nerve damage | Synonyms: paraesthesia |
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| parnassia | (noun) any of various usually evergreen bog plants of the genus Parnassia having broad smooth basal leaves and a single pale flower resembling a buttercup | Synonyms: grass-of-Parnassus |
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| paronomasia | (noun) a humorous play on words | Synonyms: pun, punning, wordplay |
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| paronychia | (noun) infection in the tissues adjacent to a nail on a finger or toe | - |
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| parosamia | (noun) a disorder in the sense of smell | Synonyms: dysosmia, olfactory impairment |
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| pavonia | (noun) any of various evergreen plants of the genus Pavonia having white or yellow or purple flowers | - |
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| pedophilia | (noun) a sexual attraction to children | Synonyms: paedophilia |
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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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| pericementoclasia | (noun) pus pocket formation around a tooth | - |
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| periodontia | (noun) the branch of dentistry dealing with diseases of the gums and other structures around the teeth | Synonyms: periodontics |
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| peripeteia | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripetia, peripety |
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| peripetia | (noun) a sudden and unexpected change of fortune or reverse of circumstances (especially in a literary work) | Synonyms: peripeteia, peripety |
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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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| petunia | (noun) any of numerous tropical herbs having fluted funnel-shaped flowers | - |
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| phacelia | (noun) any plant of the genus Phacelia | Synonyms: scorpion weed, scorpionweed |
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| phaneromania | (noun) an irresistible desire to pick at superficial body parts (as in obsessive nail-biting) | - |
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| phantasmagoria | (noun) a constantly changing medley of real or imagined images (as in a dream) | - |
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| pharmacopeia | (noun) (pharmacology) a book containing a compilation of pharmaceutical products with their formulas and methods of preparation | Synonyms: formulary |
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| pharmacopoeia | (noun) a collection or stock of drugs | - |
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| phenylketonuria | (noun) a genetic disorder of metabolism; lack of the enzyme needed to turn phenylalanine into tyrosine results in an accumulation of phenylalanine in the body fluids which causes various degrees of mental deficiency | Synonyms: PKU |
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| philia | (noun) a positive feeling of liking | Synonyms: affection, affectionateness, fondness, heart, tenderness, warmheartedness, warmness |
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| phobia | (noun) an anxiety disorder characterized by extreme and irrational fear of simple things or social situations | Synonyms: phobic disorder, phobic neurosis |
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| phobophobia | (noun) a morbid fear of developing a phobia | - |
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| phocomelia | (noun) an abnormality of development in which the upper part of an arm or leg is missing so the hands or feet are attached to the body like stumps; rare condition that results from taking thalidomide during pregnancy | Synonyms: seal limbs |
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| phonophobia | (noun) a morbid fear of sounds including your own voice | Synonyms: acousticophobia |
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| photalgia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photophobia |
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| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| physostegia | (noun) any of various plants of the genus Physostegia having sessile linear to oblong leaves and showy white or rose or lavender flowers | - |
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| pia | (noun) perennial herb of East Indies to Polynesia and Australia; cultivated for its large edible root yielding Otaheite arrowroot starch | Synonyms: Indian arrowroot, Tacca leontopetaloides, Tacca pinnatifida |
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| pignolia | (noun) edible seed of any of several nut pines especially some pinons of southwestern North America | Synonyms: pine nut, pinon nut |
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| pistia | (noun) pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes | Synonyms: Pistia stratiotes, Pistia stratoites, water cabbage, water lettuce |
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| pizzeria | (noun) a shop where pizzas are made and sold | Synonyms: pizza parlor, pizza shop |
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| planaria | (noun) free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts | Synonyms: planarian |
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| pleuralgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleurodynia |
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| pleurodynia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: costalgia, pleuralgia |
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| pleuropneumonia | (noun) pleurisy and pneumonia | - |
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| pneumonia | (noun) respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants | - |
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| podalgia | (noun) foot pain | - |
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| pogonia | (noun) any hardy bog orchid of the genus Pogonia: terrestrial orchids having slender rootstocks and erect stems bearing one or a few leaves and a solitary terminal flower | - |
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| poinsettia | (noun) tropical American plant having poisonous milk and showy tapering usually scarlet petallike leaves surrounding small yellow flowers | Synonyms: Christmas flower, Christmas star, Euphorbia pulcherrima, lobster plant, Mexican flameleaf, painted leaf |
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| polycythemia | (noun) a disorder characterized by an abnormal increase in the number of red blood cells in the blood | - |
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| polydipsia | (noun) excessive thirst (as in cases of diabetes or kidney dysfunction) | - |
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| polyuria | (noun) renal disorder characterized by the production of large volumes of pale dilute urine; often associated with diabetes | - |
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| porphyria | (noun) a genetic abnormality of metabolism causing abdominal pains and mental confusion | - |
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| potomania | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: alcoholism, dipsomania |
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| preeclampsia | (noun) abnormal state of pregnancy characterized by hypertension and fluid retention and albuminuria; can lead to eclampsia if untreated | Synonyms: pre-eclampsia |
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| presbyopia | (noun) a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45 | Synonyms: farsightedness |
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| proctalgia | (noun) pain in the rectum | - |
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| progeria | (noun) a rare abnormality marked by premature aging (grey hair and wrinkled skin and stooped posture) in a child | - |
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| prosopopoeia | (noun) representing an abstract quality or idea as a person or creature | Synonyms: personification |
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| prosthodontia | (noun) the branch of dentistry dealing with the replacement of teeth and related mouth or jaw structures by artificial devices | Synonyms: prosthodontics |
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| protanopia | (noun) dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue | Synonyms: red-blindness |
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| proteinuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: albuminuria |
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| psychedelia | (noun) the subculture of users of psychedelic drugs | - |
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| pyaemia | (noun) septicemia caused by pus-forming bacteria being released from an abscess | Synonyms: pyemia |
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| pyemia | (noun) septicemia caused by pus-forming bacteria being released from an abscess | Synonyms: pyaemia |
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| pyrexia | (noun) a rise in the temperature of the body; frequently a symptom of infection | Synonyms: febricity, febrility, fever, feverishness |
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| pyromania | (noun) an uncontrollable desire to set fire to things | - |
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| pyrophobia | (noun) a morbid fear of fire | - |
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| pyrrhuloxia | (noun) crested grey-and-red bird of southwest United States and Mexico | Synonyms: Pyrrhuloxia sinuata |
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| pyuria | (noun) presence of white blood cells in the urine; symptom of urinary tract infection | - |
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| quadrantanopia | (noun) blindness in one fourth of the visual field | - |
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| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quassia | (noun) handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark | Synonyms: bitterwood, Quassia amara |
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| (noun) a bitter compound used as an insecticide and tonic and vermifuge; extracted from the wood and bark of trees of the genera Quassia and Picrasma | - |
| quiaquia | (noun) small fusiform fish of western Atlantic | Synonyms: cigarfish, Decapterus punctatus, round scad |
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| raffia | (noun) fiber of a raffia palm used as light cordage and in making hats and baskets | - |
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| (noun) leaf fibers of the raffia palm tree; used to make baskets and mats etc. | Synonyms: raphia |
| raphia | (noun) leaf fibers of the raffia palm tree; used to make baskets and mats etc. | Synonyms: raffia |
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| ratafia | (noun) sweet liqueur made from wine and brandy flavored with plum or peach or apricot kernels and bitter almonds | Synonyms: ratafee |
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| (noun) macaroon flavored with ratafia liqueur | Synonyms: ratafia biscuit |
| rauvolfia | (noun) any shrub or small tree of the genus Rauwolfia having leaves in whorls and cymose flowers; yield substances used medicinally especially as emetics or purgatives or antihypertensives | Synonyms: rauwolfia |
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| rauwolfia | (noun) any shrub or small tree of the genus Rauwolfia having leaves in whorls and cymose flowers; yield substances used medicinally especially as emetics or purgatives or antihypertensives | Synonyms: rauvolfia |
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| (noun) any of several alkaloids extracted from the shrub Rauwolfia serpentina | - |
| regalia | (noun) paraphernalia indicative of royalty (or other high office) | - |
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| (noun) especially fine or decorative clothing | Synonyms: array, raiment |
| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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| rickettsia | (noun) any of a group of very small rod-shaped bacteria that live in biting arthropods (as ticks and mites) and cause disease in vertebrate hosts; they cause typhus and other febrile diseases in human beings | - |
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| sabbatia | (noun) any of various plants of the genus Sabbatia having usually pink cymose flowers; occur from acid bogs to brackish marshes | - |
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| salvia | (noun) any of various plants of the genus Salvia; a cosmopolitan herb | Synonyms: sage |
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| sangria | (noun) sweetened red wine and orange or lemon juice with soda water | Synonyms: sangaree |
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| sansevieria | (noun) grown as a houseplant for its mottled fleshy sword-shaped leaves or as a source of fiber | Synonyms: bowstring hemp |
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| sapraemia | (noun) blood poisoning caused by putrefactive bacteria; results from eating putrefied matter | Synonyms: sapremia |
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| sapremia | (noun) blood poisoning caused by putrefactive bacteria; results from eating putrefied matter | Synonyms: sapraemia |
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| satanophobia | (noun) an abnormal fear of Satan | - |
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