| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyotonia | (noun) lack of normal muscular tension or tonus | Synonyms: atonia, atonicity, atony |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| antiproton | (noun) an unstable negatively charged proton; the antiparticle of a proton | - |
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| antiprotozoal | (noun) a medicinal drug used to fight diseases (like malaria) that are caused by protozoa | Synonyms: antiprotozoal drug |
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| autotomy | (noun) spontaneous removal or casting off of a body part (as the tail of a lizard or claw of a lobster) especially when the organism is injured or under attack | - |
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| botulismotoxin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulin, botulinus toxin |
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| callosotomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosectomy |
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| cholelithotomy | (noun) removal of gallstone through an incision in the gallbladder | - |
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| cotoneaster | (noun) any shrub of the genus Cotoneaster: erect or creeping shrubs having richly colored autumn foliage and many small white to pinkish flowers followed by tiny red or black fruits | - |
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| craniotomy | (noun) a surgical opening through the skull | - |
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| croton | (noun) tropical Asiatic shrub; source of croton oil | Synonyms: Croton tiglium |
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| (noun) grown in many varieties for their brightly colored foliage; widely cultivated as a houseplant | Synonyms: Codiaeum variegatum |
| crotonbug | (noun) small light-brown cockroach brought to United States from Europe; a common household pest | Synonyms: Blattella germanica, Croton bug, German cockroach, water bug |
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| cytophotometer | (noun) a photometer that can be used to locate and identify chemical compounds in a cell by measuring the intensity of the light that passes through stained sections of the cytoplasm | - |
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| cytophotometry | (noun) the study of chemical compounds inside a cell by means of a cytophotometer | - |
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| cytotoxicity | (noun) the degree to which something is toxic to living cells | - |
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| cytotoxin | (noun) any substance that has a toxic effect on cells | - |
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| dichotomisation | (noun) the act of dividing into two sharply different categories | Synonyms: dichotomization |
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| dichotomization | (noun) the act of dividing into two sharply different categories | Synonyms: dichotomisation |
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| dichotomy | (noun) being twofold; a classification into two opposed parts or subclasses | Synonyms: duality |
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| ecotourism | (noun) tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature | - |
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| endotoxin | (noun) a toxin that is confined inside the microorganisms and is released only when the microorganisms are broken down or die | - |
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| enterotomy | (noun) surgical operation that creates a permanent opening through the abdominal wall into the intestine | Synonyms: enterostomy |
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| enterotoxemia | (noun) a disease of cattle and sheep that is attributed to toxins absorbed from the intestines | - |
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| enterotoxin | (noun) a cytotoxin specific for the cells of the intestinal mucosa | - |
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| episiotomy | (noun) surgical incision of the perineum to enlarge the vagina and so facilitate delivery during childbirth | - |
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| excitotoxin | (noun) any of a group of neurologically active compounds, such as glutamate and aspartame, that have detrimental excitatory effects on the central nervous system when taken in high concentrations. | - |
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| exotoxin | (noun) a toxin that is secreted by microorganisms into the surrounding medium | - |
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| gearmotor | (noun) a motor combined with a set of speed-reducing gears. | - |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| homotoxicology | (noun) analysis of sickness within the framework of the body's failure to deal with the burden of toxins. Homeopathic remedies often are used as treatment. Developed by Hans Heinrich Reckeweg. | - |
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| hypotonia | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonicity, hypotonus |
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| hypotonicity | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonia, hypotonus |
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| (noun) (of a solution) the extent to which a solution has a lower osmotic pressure than some other | - |
| hypotonus | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonia, hypotonicity |
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| hysterotomy | (noun) surgical incision into the uterus (as in cesarean section) | - |
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| iridotomy | (noun) a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma | - |
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| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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| kiloton | (noun) one thousand tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of 1000 tons of TNT | - |
| koto | (noun) Japanese stringed instrument that resembles a zither; has a rectangular wooden sounding board and usually 13 silk strings that are plucked with the fingers | - |
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| kotow | (noun) a former Chinese custom of touching the ground with the forehead as a sign of respect or submission | Synonyms: kowtow |
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| laparotomy | (noun) surgical incision into the abdominal wall; often done to examine abdominal organs | - |
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| leucotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leukotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| leukotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, lobotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| lithotomy | (noun) surgical removal of a stone (calculus) | - |
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| lobotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, leukotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| microphotometer | (noun) special kind of densitometer that measures density variations over a very small area | - |
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| microtome | (noun) scientific instrument that cuts thin slices of something for microscopic examination | - |
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| microtoponym | (noun) a name of a "minor" or small natural feature (e.g., a field, path, bridge, ditch, etc.). | - |
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| monotone | (noun) an unchanging intonation | Synonyms: drone, droning |
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| (noun) a single tone repeated with different words or different rhythms (especially in rendering liturgical texts) | - |
| monotony | (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: humdrum, sameness |
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| (noun) constancy of tone or pitch or inflection | - |
| monotopism | (noun) origin of a systematic group only once (as by mutation) or at a single location. | - |
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| motoneuron | (noun) a neuron conducting impulses outwards from the brain or spinal cord | Synonyms: efferent neuron, motor nerve fiber, motor neuron |
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| motor | (noun) machine that converts other forms of energy into mechanical energy and so imparts motion | - |
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| (noun) a nonspecific agent that imparts motion | - |
| motorbike | (noun) small motorcycle with a low frame and small wheels and elevated handlebars | Synonyms: minibike |
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| motorboat | (noun) a boat propelled by an internal-combustion engine | Synonyms: powerboat |
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| motorbus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorcoach, omnibus, passenger vehicle |
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| motorcade | (noun) a procession of people traveling in motor cars | - |
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| motorcar | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, automobile, car, machine |
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| motorcoach | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, omnibus, passenger vehicle |
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| motorcycle | (noun) a motor vehicle with two wheels and a strong frame | Synonyms: bike |
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| motorcycling | (noun) riding a motorcycle | - |
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| motorcyclist | (noun) a traveler who rides a motorcycle | - |
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| motoring | (noun) the act of driving an automobile | - |
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| motorisation | (noun) the act of motorizing (equipping with motors or with motor vehicles) | Synonyms: motorization |
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| motorist | (noun) someone who drives (or travels in) an automobile | Synonyms: automobilist |
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| motorization | (noun) the act of motorizing (equipping with motors or with motor vehicles) | Synonyms: motorisation |
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| motorman | (noun) the operator of streetcar | - |
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| motormouth | (noun) someone who talks incessantly | - |
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| motortruck | (noun) an automotive vehicle suitable for hauling | Synonyms: truck |
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| motorway | (noun) a broad highway designed for high-speed traffic | Synonyms: expressway, freeway, pike, state highway, superhighway, throughway, thruway |
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| mycotoxin | (noun) a toxin produced by a fungus | - |
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| myotomy | (noun) surgical incision or division of a muscle | - |
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| myotonia | (noun) abnormally long muscular contractions; slow relaxation of a muscle after a contraction | - |
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| myringotomy | (noun) surgical incision into the eardrum (to relieve pressure or release pus from the middle ear) | - |
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| neotony | (noun) the state resulting when juvenile characteristics are retained by the adults of a species | - |
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| nephrotomy | (noun) incision into a kidney (usually to remove a kidney stone) | - |
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| nephrotoxin | (noun) any toxin that affects the kidneys | - |
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| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
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| notochord | (noun) a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates | - |
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| notoriety | (noun) the state of being known for some unfavorable act or quality | Synonyms: ill fame |
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| notornis | (noun) flightless New Zealand birds similar to gallinules | Synonyms: Notornis mantelli, takahe |
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| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
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| opisthotonos | (noun) severe spasm in which the back arches and the head bends back and heels flex toward the back | - |
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| orchotomy | (noun) surgical incision into the testis to obtain material for analysis (as in cases of abnormally low sperm count) | - |
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| osteotomy | (noun) surgical sectioning of bone | - |
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| otoganglion | (noun) an autonomic ganglion whose postganglionic fibers are distributed to the parotid gland | Synonyms: otic ganglion |
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| otolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otorhinolaryngologist, rhinolaryngologist |
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| otolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otorhinolaryngology, rhinolaryngology |
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| otologist | (noun) a physician who specializes in the ear and its diseases | Synonyms: ear doctor, ear specialist |
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| otology | (noun) the branch of medicine concerned with the ear | - |
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| otoplasty | (noun) reconstructive surgery of the auricle of the external ear | - |
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| otorhinolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otolaryngologist, rhinolaryngologist |
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| otorhinolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otolaryngology, rhinolaryngology |
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| otorrhea | (noun) discharge from the external 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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| otoscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auriscope, auroscope |
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| perineotomy | (noun) surgical incision into the perineum | - |
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| phlebotomist | (noun) someone who practices phlebotomy | - |
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