| paresis | (noun) a slight or partial paralysis | - |
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| parthenogenesis | (noun) process in which an unfertilized egg develops into a new individual; common among insects and some other arthropods | Synonyms: parthenogeny |
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| (noun) human conception without fertilization by a man | Synonyms: parthenogeny, virgin birth |
| pasteurellosis | (noun) an acute infectious disease characterized by pneumonia and blood infection | Synonyms: hemorrhagic septicemia |
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| pathogenesis | (noun) the origination and development of a disease | - |
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| pedesis | (noun) the random motion of small particles suspended in a gas or liquid | Synonyms: Brownian motion, Brownian movement |
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| pediculosis | (noun) infestation with lice (Pediculus humanus) resulting in severe itching | Synonyms: lousiness |
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| peliosis | (noun) any of several blood diseases causing subcutaneous bleeding | Synonyms: purpura |
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| periapsis | (noun) (astronomy) the point in an orbit closest to the body being orbited | Synonyms: point of periapsis |
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| periphrasis | (noun) a style that involves indirect ways of expressing things | Synonyms: ambage, circumlocution |
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| peristalsis | (noun) the process of wavelike muscle contractions of the alimentary tract that moves food along | Synonyms: vermiculation |
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| pertussis | (noun) a disease of the respiratory mucous membrane | Synonyms: whooping cough |
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| phagocytosis | (noun) process in which phagocytes engulf and digest microorganisms and cellular debris; an important defense against infection | - |
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| phalacrosis | (noun) the condition of having no hair on the top of the head | Synonyms: baldness |
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| pheresis | (noun) a procedure in which blood is drawn and separated into its components by dialysis; some are retained and the rest are returned to the donor by transfusion | Synonyms: apheresis |
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| phimosis | (noun) an abnormal tightness of the foreskin preventing retraction over the glans | - |
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| phlebothrombosis | (noun) thrombosis of a vein without prior inflammation of the vein; associated with sluggish blood flow (as in prolonged bedrest or pregnancy or surgery) or with rapid coagulation of the blood | Synonyms: venous thrombosis |
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| photosynthesis | (noun) synthesis of compounds with the aid of radiant energy (especially in plants) | - |
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| phthisis | (noun) involving the lungs with progressive wasting of the body | Synonyms: consumption, pulmonary tuberculosis, wasting disease, white plague |
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| phycomycosis | (noun) any fungal infection caused by fungi of the Phycomycetes group | - |
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| phylogenesis | (noun) (biology) the sequence of events involved in the evolutionary development of a species or taxonomic group of organisms | Synonyms: evolution, organic evolution, phylogeny |
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| pinocytosis | (noun) process by which certain cells can engulf and incorporate droplets of fluid | - |
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| pityriasis | (noun) any of several skin disorders characterized by shedding dry flakes of skin | - |
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| plasmapheresis | (noun) plasma is separated from whole blood and the rest is returned to the donor | - |
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| plateletpheresis | (noun) platelets are separated from whole blood and the rest is returned to the donor | - |
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| pneumoconiosis | (noun) chronic respiratory disease caused by inhaling metallic or mineral particles | Synonyms: pneumonoconiosis |
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| pneumocytosis | (noun) pneumonia occurring in infants or in persons with impaired immune systems (as AIDS victims) | Synonyms: interstitial plasma cell pneumonia, pneumocystis carinii pneumonia, pneumocystis pneumonia |
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| pneumonoconiosis | (noun) chronic respiratory disease caused by inhaling metallic or mineral particles | Synonyms: pneumoconiosis |
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| poliosis | (noun) loss of color from the hair | - |
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| pollinosis | (noun) a seasonal rhinitis resulting from an allergic reaction to pollen | Synonyms: hay fever |
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| polyhidrosis | (noun) excessive and profuse perspiration | Synonyms: hyperhidrosis, hyperidrosis |
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| prognosis | (noun) a prediction of the course of a disease | Synonyms: medical prognosis, prospect |
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| (noun) a prediction about how something (as the weather) will develop | Synonyms: forecast |
| prolepsis | (noun) anticipating and answering objections in advance | - |
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| prosthesis | (noun) corrective consisting of a replacement for a part of the body | Synonyms: prosthetic device |
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| proteolysis | (noun) the hydrolysis of proteins into peptides and amino acids by cleavage of their peptide bonds | - |
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| pseudocyesis | (noun) physiological state in which a woman exhibits symptoms of pregnancy but is not pregnant | Synonyms: false pregnancy |
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| psilosis | (noun) falling out of hair | - |
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| (noun) a chronic disorder that occurs in tropical and non-tropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation | Synonyms: sprue, tropical sprue |
| psittacosis | (noun) infectious disease of birds | Synonyms: parrot disease |
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| (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: ornithosis, parrot fever |
| psoriasis | (noun) a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences | - |
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| psychoanalysis | (noun) a set of techniques for exploring underlying motives and a method of treating various mental disorders; based on the theories of Sigmund Freud | Synonyms: analysis, depth psychology |
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| psychogenesis | (noun) a general term for the origin and development of almost any aspect of the mind | - |
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| (noun) the development in the life of an individual of some disorder that is caused by psychological rather than physiological factors | - |
| psychokinesis | (noun) the power to move something by thinking about it without the application of physical force | Synonyms: telekinesis |
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| psychoneurosis | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, neuroticism |
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| psychosis | (noun) any severe mental disorder in which contact with reality is lost or highly distorted | - |
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| ptosis | (noun) drooping of the upper eyelid caused by muscle paralysis and weakness | - |
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| pycnodysostosis | (noun) a form of dwarfism accompanied by fragile bones and bad teeth | - |
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| pycnosis | (noun) a degenerative state of the cell nucleus | Synonyms: pyknosis |
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| pyknosis | (noun) a degenerative state of the cell nucleus | Synonyms: pycnosis |
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| pyrolysis | (noun) transformation of a substance produced by the action of heat | - |
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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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| rachischisis | (noun) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis | Synonyms: schistorrhachis, spina bifida |
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| radiolysis | (noun) molecular disintegration resulting from radiation | - |
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| rhinosporidiosis | (noun) fungal infection of the nose; often acquired while swimming | - |
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| rhinostenosis | (noun) narrowing of the passages in the nasal cavities | - |
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| rickettsiosis | (noun) infectious disease caused by ticks or mites or body lice infected with rickettsial bacteria | Synonyms: rickettsial disease |
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| salmonellosis | (noun) a kind of food poisoning caused by eating foods contaminated with Salmonella typhimurium | - |
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| salpiglossis | (noun) any plant of the genus Salpiglossis | - |
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| sarcoidosis | (noun) a chronic disease of unknown cause marked by the formation of nodules in the lungs and liver and lymph glands and salivary glands | - |
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| satyriasis | (noun) abnormally intense sexual desire in men | - |
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| schistosomiasis | (noun) an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East; symptoms depend on the part of the body infected | Synonyms: bilharzia, bilharziasis |
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| sclerosis | (noun) any pathological hardening or thickening of tissue | Synonyms: induration |
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| scoliosis | (noun) an abnormal lateral curve to the vertebral column | - |
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| sepsis | (noun) the presence of pus-forming bacteria or their toxins in the blood or tissues | - |
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| shigellosis | (noun) an acute infection of the intestine by shigella bacteria; characterized by diarrhea and fever and abdominal pains | Synonyms: bacillary dysentery |
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| siderosis | (noun) fibrosis of the lung caused by iron dust; occurs among welders and other metal workers | - |
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| silicosis | (noun) a lung disease caused by inhaling particles of silica or quartz or slate | - |
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| siriasis | (noun) sudden prostration due to exposure to the sun or excessive heat | Synonyms: insolation, sunstroke, thermic fever |
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| sis | (noun) a female person who has the same parents as another person | Synonyms: sister |
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| somaesthesis | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somataesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia, somesthesis |
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| somataesthesis | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somaesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia, somesthesis |
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| somesthesis | (noun) the faculty of bodily perception; sensory systems associated with the body; includes skin senses and proprioception and the internal organs | Synonyms: somaesthesia, somaesthesis, somataesthesis, somatesthesia, somatic sense, somatic sensory system, somatosensory system, somesthesia |
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| spasmolysis | (noun) the relaxation or relief of muscle spasms | - |
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| spermatogenesis | (noun) development of spermatozoa | - |
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| spondylolisthesis | (noun) a forward dislocation of one vertebra over the one beneath it producing pressure on spinal nerves | - |
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| sporotrichosis | (noun) a chronic fungal infection of the skin and lymph nodes | - |
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| stasis | (noun) inactivity resulting from a static balance between opposing forces | - |
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| (noun) an abnormal state in which the normal flow of a liquid (such as blood) is slowed or stopped | - |
| stenosis | (noun) abnormal narrowing of a bodily canal or passageway | Synonyms: stricture |
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| stypsis | (noun) the ability to contract or draw together soft body tissues to check blood flow or restrict secretion of fluids | Synonyms: astringency |
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| syllepsis | (noun) use of a word to govern two or more words though agreeing in number or case etc. with only one | - |
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| symbiosis | (noun) the relation between two different species of organisms that are interdependent; each gains benefits from the other | Synonyms: mutualism |
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| symphysis | (noun) a growing together of parts or structures | - |
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| (noun) an abnormal adhesion of two or more structures | - |
| synaeresis | (noun) the separation of liquid from a gel that is caused by contraction (as in cheese making) | Synonyms: syneresis |
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| (noun) the contraction of two vowels into a diphthong | Synonyms: syneresis |
| synapsis | (noun) the side by side pairing of homologous maternal and paternal chromosomes at the start of meiosis | - |
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| syneresis | (noun) the separation of liquid from a gel that is caused by contraction (as in cheese making) | Synonyms: synaeresis |
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| (noun) the contraction of two vowels into a diphthong | Synonyms: synaeresis |
| synezesis | (noun) the contraction of chromatin towards one side of the nucleus during the prophase of meiosis | Synonyms: synizesis |
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| synizesis | (noun) the contraction of chromatin towards one side of the nucleus during the prophase of meiosis | Synonyms: synezesis |
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| synopsis | (noun) a sketchy summary of the main points of an argument or theory | Synonyms: abstract, outline, precis |
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| synthesis | (noun) the combination of ideas into a complex whole | Synonyms: synthetic thinking |
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| (noun) reasoning from the general to the particular (or from cause to effect) | Synonyms: deduction, deductive reasoning |
| (noun) the process of producing a chemical compound (usually by the union of simpler chemical compounds) | - |
| tapinosis | (noun) (rhetoric) A figure of speech whereby something is given less importance by the name given it than it merits. | - |
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| telegnosis | (noun) apparent knowledge of distant events without using sensory perceptions | - |
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| telekinesis | (noun) the power to move something by thinking about it without the application of physical force | Synonyms: psychokinesis |
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| teratogenesis | (noun) the development of defects in an embryo | - |
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| thanatopsis | (noun) an essay expressing a view on the subject of death | - |
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| thesis | (noun) an unproved statement put forward as a premise in an argument | - |
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| (noun) a treatise advancing a new point of view resulting from research; usually a requirement for an advanced academic degree | Synonyms: dissertation |
| thoracentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracocentesis |
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| thoracocentesis | (noun) removal of fluid from the chest by centesis for diagnostic or therapeutic purposes | Synonyms: thoracentesis |
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| thrombocytosis | (noun) increase in the number of platelets in the blood which tends to cause clots to form; associated with many neoplasms and chronic infections and other diseases | - |
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| thrombolysis | (noun) the process of breaking up and dissolving blood clots | - |
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| thrombosis | (noun) the formation or presence of a thrombus (a clot of coagulated blood attached at the site of its formation) in a blood vessel | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| topognosis | (noun) recognition of the location of a stimulus on the skin | Synonyms: topognosia |
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