| schistorrhachis | (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: rachischisis, spina bifida |
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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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| scleritis | (noun) inflammation of the sclera | - |
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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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| senioritis | (noun) tiredness with the final year of high school | - |
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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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| sialadenitis | (noun) inflammation of the salivary glands | - |
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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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| sinopis | (noun) a red ocher formerly used as a pigment | Synonyms: sinoper, sinopia |
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| sinusitis | (noun) inflammation of one of the paranasal sinuses | - |
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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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| siris | (noun) large spreading Old World tree having large leaves and globose clusters of greenish-yellow flowers and long seed pods that clatter in the wind | Synonyms: Albizia lebbeck, Albizzia lebbeck, siris tree |
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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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| splenitis | (noun) inflammation of the spleen | - |
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| spondylarthritis | (noun) arthritis that affects one or more of the intervertebral joints in the spine | - |
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| spondylitis | (noun) inflammation of a spinal joint; characterized by pain and stiffness | - |
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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 | - |
| stelis | (noun) any of various small tropical American orchids of the genus Stelis having long slender racemes of numerous small to minute flowers | - |
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| stenosis | (noun) abnormal narrowing of a bodily canal or passageway | Synonyms: stricture |
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| stephanotis | (noun) any of various evergreen climbing shrubs of the genus Stephanotis having fragrant waxy flowers | - |
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| stomatitis | (noun) inflammation of the mucous membrane of the mouth | - |
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| stylostixis | (noun) treatment of pain or disease by inserting the tips of needles at specific points on the skin | Synonyms: acupuncture |
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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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| synovitis | (noun) inflammation of the synovial membrane that lines a synovial joint; results in pain and swelling | - |
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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) | - |
| syphilis | (noun) a common venereal disease caused by the treponema pallidum spirochete; symptoms change through progressive stages; can be congenital (transmitted through the placenta) | Synonyms: lues, lues venerea, pox, syph |
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| tabis | (noun) a sock with a separation for the big toe; worn with thong sandals by the Japanese | Synonyms: tabi |
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| tallis | (noun) (Judaism) a shawl with a ritually knotted fringe at each corner; worn by Jews at morning prayer | Synonyms: prayer shawl, tallith |
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| 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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| tapis | (noun) a heavy textile with a woven design; used for curtains and upholstery | Synonyms: tapestry |
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| tarsitis | (noun) inflammation of the eyelid | - |
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| taxis | (noun) a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism | - |
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| (noun) the surgical procedure of manually restoring a displaced body part | - |
| 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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| temporalis | (noun) muscle extending from the temporal fossa to the coronoid process of the mandible; acts to raise the mandible and close the jaws | Synonyms: musculus temporalis, temporal muscle, temporalis muscle |
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| tendinitis | (noun) inflammation of a tendon | Synonyms: tendonitis, tenonitis |
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| tendonitis | (noun) inflammation of a tendon | Synonyms: tendinitis, tenonitis |
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| tendosynovitis | (noun) inflammation of a tendon and its enveloping sheath | Synonyms: tendonous synovitis, tenosynovitis |
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| tennis | (noun) a game played with rackets by two or four players who hit a ball back and forth over a net that divides the court | Synonyms: lawn tennis |
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| tenonitis | (noun) inflammation of a tendon | Synonyms: tendinitis, tendonitis |
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| tenosynovitis | (noun) inflammation of a tendon and its enveloping sheath | Synonyms: tendonous synovitis, tendosynovitis |
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| teratogenesis | (noun) the development of defects in an embryo | - |
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| testis | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, bollock, egg, nut, orchis, testicle |
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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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| thrombophlebitis | (noun) phlebitis in conjunction with the formation of a blood clot (thrombus) | - |
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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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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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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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| thyrsopteris | (noun) a terrestrial tree fern of South America | Synonyms: Thyrsopteris elegans |
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| tibialis | (noun) either of two skeletal muscle in each leg arising from the tibia; provides for movement of the foot | Synonyms: musculus tibialis, tibialis muscle |
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| tonsillitis | (noun) inflammation of the tonsils (especially the palatine tonsils) | - |
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| topognosis | (noun) recognition of the location of a stimulus on the skin | Synonyms: topognosia |
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| torticollis | (noun) an unnatural condition in which the head leans to one side because the neck muscles on that side are contracted | Synonyms: wryneck |
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| toxoplasmosis | (noun) infection caused by parasites transmitted to humans from infected cats; if contracted by a pregnant woman it can result in serious damage to the fetus | - |
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| tracheitis | (noun) inflammation of the trachea | - |
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| tracheobronchitis | (noun) common respiratory infection characterized by inflammation of the trachea and the bronchi | - |
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| trellis | (noun) latticework used to support climbing plants | Synonyms: treillage |
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| trichiniasis | (noun) infestation by trichina larvae that are transmitted by eating inadequately cooked meat (especially pork); larvae migrate from the intestinal tract to the muscles where they become encysted | Synonyms: myositis trichinosa, trichinosis |
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| trichinosis | (noun) infestation by trichina larvae that are transmitted by eating inadequately cooked meat (especially pork); larvae migrate from the intestinal tract to the muscles where they become encysted | Synonyms: myositis trichinosa, trichiniasis |
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| trichomoniasis | (noun) infection of the vagina | - |
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| trichuriasis | (noun) infestation by a roundworm; common in tropical areas with poor sanitation | - |
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| trochlearis | (noun) either of the two cranial nerves on either side that control the superior oblique muscles of the eyes | Synonyms: fourth cranial nerve, trochlear, trochlear nerve |
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| trombiculiasis | (noun) infestation with chiggers | - |
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| trophobiosis | (noun) a symbiotic relation in which one organism protects the other in return for some kind of food product | - |
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| tsoris | (noun) (Yiddish) trouble and suffering | - |
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| tsuris | (noun) (Yiddish) aggravating trouble | - |
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| tuberculosis | (noun) infection transmitted by inhalation or ingestion of tubercle bacilli and manifested in fever and small lesions (usually in the lungs but in various other parts of the body in acute stages) | Synonyms: T.B., TB |
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| tympanitis | (noun) inflammation of the inner ear | - |
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| ulitis | (noun) inflammation of the gums | - |
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| unguis | (noun) any rigid body structure composed primarily of keratin | Synonyms: horny structure |
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| uranalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: urinalysis |
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| urarthritis | (noun) a painful inflammation of the big toe and foot caused by defects in uric acid metabolism resulting in deposits of the acid and its salts in the blood and joints | Synonyms: gout, gouty arthritis |
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| ureteritis | (noun) inflammation of the ureter | - |
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| ureterostenosis | (noun) stenosis of the ureter | - |
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| urethritis | (noun) inflammation of the urethra; results in painful urination | - |
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| urinalysis | (noun) (medicine) the chemical analysis of urine (for medical diagnosis) | Synonyms: uranalysis |
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