| moniliasis | (noun) an infection caused by fungi of the genus Monilia or Candida (especially Candida albicans) | Synonyms: candidiasis, monilia disease |
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| monocytosis | (noun) increase in the number of monocytes in the blood; symptom of monocytic leukemia | - |
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| monogenesis | (noun) asexual reproduction by the production and release of spores | Synonyms: sporulation |
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| mononucleosis | (noun) an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing | Synonyms: glandular fever, infectious mononucleosis, kissing disease, mono |
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| morphallaxis | (noun) regeneration on a reduced scale of a body part; observed especially in invertebrates such as certain lobsters | - |
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| morphogenesis | (noun) differentiation and growth of the structure of an organism (or a part of an organism) | - |
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| mucopolysaccharidosis | (noun) any of a group of genetic disorders involving a defect in the metabolism of mucopolysaccharides resulting in greater than normal levels of mucopolysaccharides in tissues | - |
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| mucoviscidosis | (noun) the most common hereditary disease; the child's lungs and intestines and pancreas become clogged with thick mucus; caused by defect in a single gene; no cure is known | Synonyms: CF, cystic fibrosis, fibrocystic disease of the pancreas, pancreatic fibrosis |
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| mutagenesis | (noun) an event capable of causing a mutation | - |
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| mycosis | (noun) an inflammatory condition caused by a fungus | Synonyms: fungal infection |
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| mydriasis | (noun) reflex pupillary dilation as a muscle pulls the iris outward; occurs in response to a decrease in light or certain drugs | - |
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| myelitis | (noun) inflammation of the spinal cord | - |
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| myelofibrosis | (noun) fibrosis of the bone marrow | - |
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| myiasis | (noun) infestation of the body by the larvae of flies (usually through a wound or other opening) or any disease resulting from such infestation | - |
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| myocarditis | (noun) inflammation of the myocardium (the muscular tissue of the heart) | Synonyms: myocardial inflammation |
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| myometritis | (noun) inflammation of the myometrium | - |
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| myonecrosis | (noun) localized death of muscle cell fibers | - |
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| myosis | (noun) reflex contraction of the sphincter muscle of the iris in response to a bright light (or certain drugs) causing the pupil to become smaller | Synonyms: light reflex, miosis, pupillary reflex |
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| (noun) an acute infectious disease occurring in epidemic form and featuring paroxysms of pain (usually in the chest) | Synonyms: Bornholm disease, diaphragmatic pleurisy, epidemic myalgia, epidemic pleurodynia |
| myositis | (noun) inflammation of muscle tissue | - |
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| myxomatosis | (noun) a viral disease (usually fatal) of rabbits | - |
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| narcosis | (noun) unconsciousness induced by narcotics or anesthesia | - |
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| naris | (noun) any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx | - |
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| natriuresis | (noun) the presence of abnormally large amounts of sodium in the urine | - |
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| necrobiosis | (noun) (physiology) the normal degeneration and death of living cells (as in various epithelial cells) | Synonyms: cell death |
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| necrolysis | (noun) disintegration and dissolution of dead tissue | - |
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| necropolis | (noun) a tract of land used for burials | Synonyms: burial ground, burial site, burying ground, cemetery, graveyard, memorial park |
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| necrosis | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, sphacelus |
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| nemesis | (noun) something causing misery or death | Synonyms: bane, curse, scourge |
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| nephritis | (noun) an inflammation of the kidney | Synonyms: Bright's disease |
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| nephroangiosclerosis | (noun) kidney disease that is usually associated with hypertension; sclerosis of the renal arterioles reduces blood flow that can lead to kidney failure and heart failure | Synonyms: nephrosclerosis |
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| nephrocalcinosis | (noun) renal lithiasis in which calcium deposits form in the renal parenchyma and result in reduced kidney function and blood in the urine | - |
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| nephrolithiasis | (noun) the presence of kidney stones (calculi) in the kidney | Synonyms: renal lithiasis |
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| nephroptosis | (noun) prolapse of the kidney | Synonyms: nephroptosia |
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| nephrosclerosis | (noun) kidney disease that is usually associated with hypertension; sclerosis of the renal arterioles reduces blood flow that can lead to kidney failure and heart failure | Synonyms: nephroangiosclerosis |
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| nephrosis | (noun) a disease affecting the kidneys | Synonyms: kidney disease, nephropathy, renal disorder |
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| (noun) a syndrome characterized by edema and large amounts of protein in the urine and usually increased blood cholesterol; usually associated with glomerulonephritis or with a complication of various systemic diseases | Synonyms: nephrotic syndrome |
| nephthytis | (noun) any plant of the genus Nephthytis | - |
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| neuritis | (noun) inflammation of a nerve accompanied by pain and sometimes loss of function | - |
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| neurodermatitis | (noun) dermatitis in which localized areas (especially the forearms or back of the neck or outer part of the ankle) itch persistently; cause is unknown | - |
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| neurofibromatosis | (noun) autosomal dominant disease characterized by numerous neurofibromas and by spots on the skin and often by developmental abnormalities | Synonyms: von Recklinghausen's disease |
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| neurogenesis | (noun) the development of nerve tissues | - |
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| neurohypophysis | (noun) the posterior lobe of the pituitary body; primarily glandular in nature | Synonyms: pars nervosa, posterior pituitary, posterior pituitary gland |
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| neurosis | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neuroticism, psychoneurosis |
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| neurosyphilis | (noun) syphilis of the central nervous system | - |
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| noesis | (noun) the psychological result of perception and learning and reasoning | Synonyms: cognition, knowledge |
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| notornis | (noun) flightless New Zealand birds similar to gallinules | Synonyms: Notornis mantelli, takahe |
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| nucleosynthesis | (noun) (astronomy) the cosmic synthesis of atoms more complex than the hydrogen atom | - |
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| oasis | (noun) a shelter serving as a place of safety or sanctuary | Synonyms: haven |
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| (noun) a fertile tract in a desert (where the water table approaches the surface) | - |
| ochronosis | (noun) an accumulation of dark pigment in cartilage and other connective tissue; usually a symptom of alkaptonuria or phenol poisoning | - |
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| odontiasis | (noun) the eruption through the gums of baby teeth | Synonyms: dentition, teething |
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| oesophagitis | (noun) inflammation of the esophagus; often caused by gastroesophageal reflux | Synonyms: esophagitis |
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| omphaloskepsis | (noun) literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption | Synonyms: navel-gazing |
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| onchocerciasis | (noun) infestation with slender threadlike roundworms (filaria) deposited under the skin by the bite of black fleas; when the eyes are involved it can result in blindness; common in Africa and tropical America | Synonyms: river blindness |
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| ontogenesis | (noun) (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level | Synonyms: development, growing, growth, maturation, ontogeny |
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| onycholysis | (noun) separation of a nail from its normal attachment to the nail bed | - |
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| onychosis | (noun) any disease or disorder of the nails | - |
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| onyxis | (noun) toenail having its free tip or edges embedded in the surrounding flesh | Synonyms: ingrown toenail |
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| oogenesis | (noun) development of ova | - |
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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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| opisthorchiasis | (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia | - |
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| orchis | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, bollock, egg, nut, testicle, testis |
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| (noun) any of various deciduous terrestrial orchids having fleshy tubers and flowers in erect terminal racemes | - |
| orchitis | (noun) inflammation of one or both testes; characterized by pain and swelling | - |
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| ornithosis | (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: parrot fever, psittacosis |
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| orris | (noun) German iris having large white flowers with lavender-tinged falls and a fragrant rhizome | Synonyms: Florentine iris, Iris florentina, Iris germanica florentina |
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| (noun) fragrant rootstock of various irises especially Florentine iris; used in perfumes and medicines | Synonyms: orrisroot |
| osmosis | (noun) (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal | - |
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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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| osteoclasis | (noun) treatment of a skeletal deformity by intentionally fracturing a bone | - |
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| osteolysis | (noun) lysis of bone caused by disease or infection or inadequate blood supply | - |
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| osteomyelitis | (noun) an inflammation of bone and bone marrow (usually caused by bacterial infection) | - |
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| osteopetrosis | (noun) an inherited disorder characterized by an increase in bone density; in severe forms the bone marrow cavity may be obliterated | Synonyms: Albers-Schonberg disease, marble bones disease |
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| osteoporosis | (noun) abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common in postmenopausal women | - |
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| osteosclerosis | (noun) abnormal hardening or eburnation of bone | - |
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| otitis | (noun) inflammation of the ear | - |
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| otosclerosis | (noun) hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness | - |
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| ovaritis | (noun) inflammation of the ovaries | - |
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| overemphasis | (noun) too much emphasis | - |
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| ovotestis | (noun) hermaphroditic gonad that contains both testicular and ovarian tissue | - |
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| oxalis | (noun) any plant or flower of the genus Oxalis | Synonyms: sorrel, wood sorrel |
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| palingenesis | (noun) emergence during embryonic development of various characters or structures that appeared during the evolutionary history of the strain or species | Synonyms: recapitulation |
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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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| paracentesis | (noun) centesis of the belly to remove fluid for diagnosis | Synonyms: abdominocentesis |
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| paraleipsis | (noun) suggesting by deliberately concise treatment that much of significance is omitted | Synonyms: paralepsis, paralipsis, preterition |
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| paralepsis | (noun) suggesting by deliberately concise treatment that much of significance is omitted | Synonyms: paraleipsis, paralipsis, preterition |
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| paralipsis | (noun) suggesting by deliberately concise treatment that much of significance is omitted | Synonyms: paraleipsis, paralepsis, preterition |
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| paralysis | (noun) loss of the ability to move a body part | Synonyms: palsy |
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| parametritis | (noun) inflammation of connective tissue adjacent to the uterus | - |
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| paraparesis | (noun) a slight paralysis or weakness of both legs | - |
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| paraphrasis | (noun) rewording for the purpose of clarification | Synonyms: paraphrase |
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| paraphysis | (noun) a sterile simple or branched filament or hair borne among sporangia; may be pointed or clubbed | - |
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| parapraxis | (noun) a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc. | Synonyms: miscue, slip-up, slip |
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| parenesis | (noun) (rhetoric) exhortation; admonition. | - |
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| parenthesis | (noun) either of two punctuation marks (or) used to enclose textual material | - |
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| (noun) a message that departs from the main subject | Synonyms: aside, digression, divagation, excursus |
| paresis | (noun) a slight or partial paralysis | - |
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| parotitis | (noun) inflammation of one or both parotid glands | - |
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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 |
| parvis | (noun) a courtyard or portico in front of a building (especially a cathedral) | - |
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