| ibis | (noun) wading birds of warm regions having long slender down-curved bills | - |
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| ichthyosis | (noun) any of several congenital diseases in which the skin is dry and scaly like a fish | - |
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| ileitis | (noun) inflammation of the ileum | - |
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| immunoelectrophoresis | (noun) electrophoresis to separate antigens and antibodies | - |
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| indris | (noun) large short-tailed lemur of Madagascar having thick silky fur in black and white and fawn | Synonyms: indri, Indri brevicaudatus, Indri indri |
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| ionophoresis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: cataphoresis, dielectrolysis, electrophoresis |
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| iontophoresis | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontotherapy |
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| iridocyclitis | (noun) inflammation of the iris and ciliary body of the eye | - |
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| iridokeratitis | (noun) inflammation of the iris and cornea of the eye | - |
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| iris | (noun) diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | Synonyms: iris diaphragm |
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| (noun) muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye | - |
| (noun) plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | Synonyms: flag, fleur-de-lis, sword lily |
| iritis | (noun) inflammation of the iris | - |
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| jejunitis | (noun) inflammation of the jejunum of the small intestine | - |
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| jejunoileitis | (noun) inflammation of the jejunum and the ileum of the small intestine | - |
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| kainogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: caenogenesis, cainogenesis, cenogenesis, kenogenesis |
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| kaliuresis | (noun) the presence of excess potassium in the urine | Synonyms: kaluresis |
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| kaluresis | (noun) the presence of excess potassium in the urine | Synonyms: kaliuresis |
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| karyokinesis | (noun) organic process consisting of the division of the nucleus of a cell during mitosis or meiosis | - |
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| karyolysis | (noun) disintegration and dissolution of a cell nucleus when a cell dies | - |
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| katharsis | (noun) (psychoanalysis) purging of emotional tensions | Synonyms: abreaction, catharsis |
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| (noun) purging the body by the use of a cathartic to stimulate evacuation of the bowels | Synonyms: catharsis, purgation |
| kenogenesis | (noun) introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution) | Synonyms: caenogenesis, cainogenesis, cenogenesis, kainogenesis |
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| kenosis | (noun) the concept of emptying one's own will and receive God's will, in Catholicism | - |
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| keratitis | (noun) inflammation of the cornea causing watery painful eyes and blurred vision | - |
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| keratoconjunctivitis | (noun) inflammation of the cornea and conjunctiva | - |
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| keratoiritis | (noun) inflammation of the cornea and the iris of the eye | - |
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| keratomycosis | (noun) fungal infection of the cornea | - |
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| keratonosis | (noun) any abnormal condition of the outer skin (epidermis) | - |
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| keratoscleritis | (noun) inflammation of the cornea and sclera of the eye | - |
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| keratosis | (noun) a skin condition marked by an overgrowth of layers of horny skin | - |
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| ketoacidosis | (noun) acidosis with an accumulation of ketone bodies; occurs primarily in diabetes mellitus | Synonyms: diabetic acidosis |
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| ketosis | (noun) an abnormal increase of ketone bodies in the blood as in diabetes mellitus | Synonyms: acetonemia, ketonemia |
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| khakis | (noun) a military uniform made of khaki fabric | - |
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| kinaesthesis | (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesia, kinesthesia, kinesthesis, kinesthetics, muscle sense, sense of movement |
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| kinesis | (noun) a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation | - |
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| kinesthesis | (noun) the ability to feel movements of the limbs and body | Synonyms: kinaesthesia, kinaesthesis, kinesthesia, kinesthetics, muscle sense, sense of movement |
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| 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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| kris | (noun) a Malayan dagger with a wavy blade | Synonyms: crease, creese |
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| kumis | (noun) an alcoholic beverage made from fermented mare's milk; made originally by nomads of central Asia | Synonyms: koumiss |
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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 |
| labyrinthitis | (noun) inflammation of the inner ear; can cause vertigo and vomiting | Synonyms: otitis interna |
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| laminitis | (noun) inflammation of the laminated tissue that attaches the hoof to the foot of a horse | Synonyms: founder |
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| laryngitis | (noun) inflammation of the mucous membrane of the larynx; characterized by hoarseness or loss of voice and coughing | - |
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| laryngopharyngitis | (noun) inflammation of the larynx and pharynx | - |
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| laryngostenosis | (noun) abnormal narrowing of the larynx | - |
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| laryngotracheobronchitis | (noun) inflammation of the larynx and trachea and bronchial passageways | - |
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| lecanopteris | (noun) any of several bizarre ferns of the genus Lecanopteris having swollen hollow rhizomes that provide homes for symbiotic ants | - |
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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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| leptomeningitis | (noun) inflammation of the leptomeninges | - |
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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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| leukoencephalitis | (noun) inflammation of the white matter of the brain | - |
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| levis | (noun) a popular brand of jeans | Synonyms: Levi's |
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| lexis | (noun) all of the words in a language; all word forms having meaning or grammatical function | - |
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| liparis | (noun) an orchid of the genus Liparis having few leaves and usually fairly small yellow-green or dull purple flowers in terminal racemes | - |
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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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| lychnis | (noun) mostly perennial herbs with sticky stems that catch insects; widespread in north temperate zone | Synonyms: catchfly |
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| lymphadenitis | (noun) inflammation of lymph nodes | - |
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| lymphangiectasis | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasia |
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| lymphangitis | (noun) inflammation of a lymph vessel | - |
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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 | - |
| maconnais | (noun) fine Burgundy wine usually white and dry | Synonyms: macon |
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| macrocytosis | (noun) the presence of macrocytes in the blood | - |
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| malinois | (noun) fawn-colored short-haired sheepdog | - |
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| mantis | (noun) predacious long-bodied large-eyed insect of warm regions; rests with forelimbs raised as in prayer | Synonyms: mantid |
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| marquis | (noun) nobleman (in various countries) ranking above a count | Synonyms: marquess |
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| mastitis | (noun) inflammation of a breast (or udder) | - |
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| mastoiditis | (noun) inflammation of the mastoid | - |
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| mavis | (noun) common Old World thrush noted for its song | Synonyms: song thrush, throstle, Turdus philomelos |
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| megalopolis | (noun) a very large urban complex (usually involving several cities and towns) | - |
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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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| meningitis | (noun) infectious disease characterized by inflammation of the meninges (the tissues that surround the brain or spinal cord) usually caused by a bacterial infection; symptoms include headache and stiff neck and fever and nausea | - |
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| meningoencephalitis | (noun) inflammation of the brain and spinal cord and their meninges | Synonyms: cerebromeningitis, encephalomeningitis |
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| mephitis | (noun) a distinctive odor that is offensively unpleasant | Synonyms: fetor, foetor, malodor, malodour, reek, stench, stink |
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| (noun) a poisonous or foul smelling gas emitted from the earth | - |
| 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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| metritis | (noun) inflammation of the lining of the uterus (of the endometrium) | Synonyms: endometritis |
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| metropolis | (noun) people living in a large densely populated municipality | Synonyms: city |
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| (noun) a large and densely populated urban area; may include several independent administrative districts | Synonyms: city, urban center |
| 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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| micropenis | (noun) an abnormally small penis | Synonyms: microphallus |
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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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