| kinetosis | (noun) the state of being dizzy or nauseated because of the motions that occur while traveling in or on a moving vehicle | Synonyms: motion sickness |
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| kraurosis | (noun) atrophy and shriveling of the skin or mucous membrane | - |
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| kyphosis | (noun) The property of having an abnormal convex curvature in the cervical or lumbar regions of the spine. | - |
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| (noun) an abnormal backward curve to the vertebral column | Synonyms: humpback, hunchback |
| laryngostenosis | (noun) abnormal narrowing of the larynx | - |
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| leishmaniasis | (noun) sores resulting from a tropical infection by protozoa of the genus Leishmania which are spread by sandflies | Synonyms: kala azar, leishmaniosis |
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| leishmaniosis | (noun) sores resulting from a tropical infection by protozoa of the genus Leishmania which are spread by sandflies | Synonyms: kala azar, leishmaniasis |
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| leptospirosis | (noun) an infectious disease cause by leptospira and transmitted to humans from domestic animals; characterized by jaundice and fever | Synonyms: swamp fever |
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| leresis | (noun) rambling talkativeness (especially in the aged) | - |
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| leucocytosis | (noun) an abnormal increase in the number of white blood cells in the blood as a result of infection (as in leukemia) | Synonyms: leukocytosis |
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| leukocytosis | (noun) an abnormal increase in the number of white blood cells in the blood as a result of infection (as in leukemia) | Synonyms: leucocytosis |
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| lipidosis | (noun) a disorder of lipid metabolism; abnormal levels of certain fats accumulate in the body | - |
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| lipomatosis | (noun) pathology in which fat accumulates in lipomas in the body | - |
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| listeriosis | (noun) an infectious disease of animals and humans (especially newborn or immunosuppressed persons) caused by the bacterium Listeria monocytogenes; in sheep and cattle the infection frequently involves the central nervous system and causes various neurological symptoms | Synonyms: listeria meningitis |
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| lithiasis | (noun) the formation of stones (calculi) in an internal organ | - |
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| lithuresis | (noun) passing small stones with the urine | - |
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| lordosis | (noun) an abnormal inward (forward) curvature of the vertebral column | Synonyms: hollow-back |
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| lymphangiectasis | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasia |
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| lymphocytosis | (noun) an abnormal increase in the number of lymphocytes in the circulating blood | - |
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| lymphopoiesis | (noun) the formation of lymphocytes in the bone marrow and lymph nodes and thymus and spleen | - |
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| lysis | (noun) (biochemistry) dissolution or destruction of cells such as blood cells or bacteria | - |
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| (noun) recuperation in which the symptoms of an acute disease gradually subside | - |
| macrocytosis | (noun) the presence of macrocytes in the blood | - |
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| meiosis | (noun) understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary) | Synonyms: litotes |
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| (noun) (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants) | Synonyms: miosis, reduction division |
| melanosis | (noun) a condition characterized by abnormal deposits of melanin (especially in the skin) | Synonyms: melanism |
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| metacyesis | (noun) pregnancy resulting from gestation elsewhere than in the uterus | Synonyms: eccyesis, ectopic gestation, ectopic pregnancy, extrauterine gestation, extrauterine pregnancy |
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| metagenesis | (noun) alternation of sexual and asexual generations | Synonyms: digenesis |
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| metalepsis | (noun) substituting metonymy of one figurative sense for another | - |
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| metamorphosis | (noun) a complete change of physical form or substance especially as by magic or witchcraft | - |
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| (noun) a striking change in appearance or character or circumstances | Synonyms: transfiguration |
| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metabolism |
| metaphysis | (noun) the growing part of a long bone between the diaphysis and the epiphysis | - |
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| metastasis | (noun) the spreading of a disease (especially cancer) to another part of the body | - |
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| metathesis | (noun) a chemical reaction between two compounds in which parts of each are interchanged to form two new compounds (AB+CD=AD+CB) | Synonyms: double decomposition, double decomposition reaction |
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| (noun) a linguistic process of transposition of sounds or syllables within a word or words within a sentence | - |
| metempsychosis | (noun) after death the soul begins a new cycle of existence in another human body | Synonyms: rebirth |
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| metroptosis | (noun) prolapse of the uterus | Synonyms: descensus uteri |
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| microcytosis | (noun) a blood disorder characterized by the presence of microcytes (abnormally small red blood cells) in the blood; often associated with anemia | - |
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| mimesis | (noun) the imitative representation of nature and human behavior in art and literature | - |
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| (noun) the representation of another person's words in a speech | - |
| (noun) any disease that shows symptoms characteristic of another disease | - |
| miosis | (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, myosis, pupillary reflex |
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| (noun) (genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants) | Synonyms: meiosis, reduction division |
| missis | (noun) informal term of address for someone's wife | Synonyms: missus |
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| mitosis | (noun) cell division in which the nucleus divides into nuclei containing the same number of chromosomes | - |
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| 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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| 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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| 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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| 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 |
| 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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| 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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| 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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| 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 |
| 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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| noesis | (noun) the psychological result of perception and learning and reasoning | Synonyms: cognition, knowledge |
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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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| 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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| oogenesis | (noun) development of ova | - |
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| opisthorchiasis | (noun) infestation with flukes obtained from eating raw fish; common in eastern Asia | - |
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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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| 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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| 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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| 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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| otosclerosis | (noun) hereditary disorder in which ossification of the labyrinth of the inner ear causes tinnitus and eventual deafness | - |
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| overemphasis | (noun) too much emphasis | - |
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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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| 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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| 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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| 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 |