| oesophagitis | (noun) inflammation of the esophagus; often caused by gastroesophageal reflux | Synonyms: esophagitis |
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| oophoritis | (noun) inflammation of one or both ovaries | - |
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| ophthalmitis | (noun) severe conjunctivitis | Synonyms: ophthalmia |
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| orchitis | (noun) inflammation of one or both testes; characterized by pain and swelling | - |
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| osteitis | (noun) inflammation of a bone as a consequence of infection or trauma or degeneration | - |
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| osteoarthritis | (noun) chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age | Synonyms: degenerative arthritis, degenerative joint disease |
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| osteomyelitis | (noun) an inflammation of bone and bone marrow (usually caused by bacterial infection) | - |
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| otitis | (noun) inflammation of the ear | - |
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| ovaritis | (noun) inflammation of the ovaries | - |
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| ovotestis | (noun) hermaphroditic gonad that contains both testicular and ovarian tissue | - |
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| pancarditis | (noun) inflammation of the entire heart (the epicardium and the myocardium and the endocardium) | - |
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| pancreatitis | (noun) inflammation of the pancreas; usually marked by abdominal pain | - |
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| panencephalitis | (noun) diffuse inflammation of the entire brain | - |
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| pansinusitis | (noun) inflammation of all of the paranasal sinuses | - |
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| parametritis | (noun) inflammation of connective tissue adjacent to the uterus | - |
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| parotitis | (noun) inflammation of one or both parotid glands | - |
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| pastis | (noun) similar to absinthe but containing no wormwood | - |
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| periarteritis | (noun) inflammation of the outer coat of an artery | - |
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| pericarditis | (noun) inflammation of the pericardium | - |
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| periodontitis | (noun) a disease that attacks the gum and bone and around the teeth | Synonyms: periodontal disease |
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| peritonitis | (noun) inflammation of the peritoneum | Synonyms: peritoneal inflammation |
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| pestis | (noun) a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal | Synonyms: pest, pestilence, plague |
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| phalangitis | (noun) inflammation of a finger or toe | - |
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| pharyngitis | (noun) inflammation of the fauces and pharynx | Synonyms: raw throat, sore throat |
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| phlebitis | (noun) inflammation of a vein (usually in the legs) | - |
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| photoretinitis | (noun) damage to the retina resulting from exposure of the eye to the sun without adequate protection | - |
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| phrenitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: cephalitis, encephalitis |
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| pneumonitis | (noun) inflammation of the lungs; caused by a virus or an allergic reaction | - |
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| poliomyelitis | (noun) an acute viral disease marked by inflammation of nerve cells of the brain stem and spinal cord | Synonyms: acute anterior poliomyelitis, infantile paralysis, polio |
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| polyarteritis | (noun) inflammation of several arteries | - |
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| polymyositis | (noun) myositis characterized by weakness of limb and neck muscles and much muscle pain and swelling; progression and severity vary among individuals | - |
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| polyneuritis | (noun) inflammation of many or all of the peripheral nerves (as in leprosy) | Synonyms: multiple neuritis |
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| posthitis | (noun) inflammation of the foreskin of the penis; usually caused by bacterial infection | - |
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| proctitis | (noun) inflammation of the rectum; marked by bloody stools and a frequent urge to defecate; frequently associated with Crohn's disease or ulcerative colitis | - |
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| prostatitis | (noun) inflammation of the prostate gland characterized by perineal pain and irregular urination and (if severe) chills and fever | - |
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| pyelitis | (noun) inflammation of the renal pelvis | - |
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| pyelonephritis | (noun) inflammation of the kidney and its pelvis caused by bacterial infection | - |
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| rachitis | (noun) childhood disease caused by deficiency of vitamin D and sunlight associated with impaired metabolism of calcium and phosphorus | Synonyms: rickets |
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| (noun) inflammation of the vertebral column | - |
| radiculitis | (noun) inflammation of the radicle of a nerve | - |
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| retinitis | (noun) inflammation of the retina | - |
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| rhinitis | (noun) an inflammation of the mucous membrane lining the nose (usually associated with nasal discharge) | Synonyms: coryza |
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| rhinotracheitis | (noun) a respiratory infection of the nose and throat in cattle | - |
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| salpingitis | (noun) inflammation of a Fallopian tube (usually the result of infection spreading from the vagina or uterus) or of a Eustachian tube | - |
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| scleritis | (noun) inflammation of the sclera | - |
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| senioritis | (noun) tiredness with the final year of high school | - |
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| sialadenitis | (noun) inflammation of the salivary glands | - |
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| sinusitis | (noun) inflammation of one of the paranasal sinuses | - |
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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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| 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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| synovitis | (noun) inflammation of the synovial membrane that lines a synovial joint; results in pain and swelling | - |
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| tarsitis | (noun) inflammation of the eyelid | - |
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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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| 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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| 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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| thrombophlebitis | (noun) phlebitis in conjunction with the formation of a blood clot (thrombus) | - |
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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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| tonsillitis | (noun) inflammation of the tonsils (especially the palatine tonsils) | - |
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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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| tympanitis | (noun) inflammation of the inner ear | - |
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| ulitis | (noun) inflammation of the gums | - |
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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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| urethritis | (noun) inflammation of the urethra; results in painful urination | - |
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| uveitis | (noun) inflammation of the uvea of the eye | - |
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| uvulitis | (noun) inflammation of the uvula | - |
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| vaginitis | (noun) inflammation of the vagina (usually associated with candidiasis) | - |
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| valvulitis | (noun) inflammation of a valve (especially of a cardiac valve as a consequence of rheumatic fever) | - |
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| vasculitis | (noun) inflammation of a blood vessel | - |
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| vasovesiculitis | (noun) inflammation of the vas deferens and seminal vesicles; usually occurring with prostatitis | - |
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| vesiculitis | (noun) inflammation of a seminal vesicle (usually in conjunction with prostatitis) | - |
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| vulvitis | (noun) inflammation of the vulva | - |
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| vulvovaginitis | (noun) inflammation of the vulva and the vagina | - |
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