| metatherian | (noun) primitive pouched mammals found mainly in Australia and the Americas | - |
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| mother | (noun) a condition that is the inspiration for an activity or situation | - |
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| (noun) a woman who has given birth to a child (also used as a term of address to your mother) | Synonyms: female parent |
| (noun) a term of address for a mother superior | - |
| (noun) a term of address for an elderly woman | - |
| (noun) a stringy slimy substance consisting of yeast cells and bacteria; forms during fermentation and is added to cider or wine to produce vinegar | - |
| motherese | (noun) an adult's imitation of the speech of a young child | Synonyms: baby talk, babytalk |
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| motherfucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, cocksucker, dickhead, mother fucker, prick, shit, SOB, son of a bitch, whoreson |
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| motherhood | (noun) the kinship relation between an offspring and the mother | Synonyms: maternity |
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| motherland | (noun) the country where you were born | Synonyms: country of origin, fatherland, homeland, mother country, native land |
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| motherliness | (noun) the quality of having or showing the tenderness and warmth and affection of or befitting a mother | Synonyms: maternal quality, maternalism, maternity |
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| motherwort | (noun) bitter Old World herb of hedgerows and woodland margins having toothed leaves and white or pale pink flowers | Synonyms: Leonurus cardiaca |
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| netherworld | (noun) (religion) the world of the dead | Synonyms: Hades, Hell, infernal region, Scheol, underworld |
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| normothermia | (noun) normal body temperature | - |
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| norther | (noun) a wind that blows from the north | Synonyms: boreas, north wind, northerly |
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| northerly | (noun) a wind that blows from the north | Synonyms: boreas, north wind, norther |
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| northernness | (noun) the property of being to the north | - |
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| otherness | (noun) the quality of being not alike; being distinct or different from that otherwise experienced or known | Synonyms: distinctness, separateness |
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| otherworld | (noun) an abstract spiritual world beyond earthly reality | - |
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| otherworldliness | (noun) concern with things of the spirit | Synonyms: spiritism, spiritualism, spirituality |
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| panther | (noun) a leopard in the black color phase | - |
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| (noun) a large spotted feline of tropical America similar to the leopard; in some classifications considered a member of the genus Felis | Synonyms: Felis onca, jaguar, Panthera onca |
| (noun) large American feline resembling a lion | Synonyms: catamount, cougar, Felis concolor, mountain lion, painter, puma |
| phototherapy | (noun) the use of strong light to treat acne or hyperbilirubinemia of the newborn | - |
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| physiotherapist | (noun) therapist who treats injury or dysfunction with exercises and other physical treatments of the disorder | Synonyms: physical therapist |
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| physiotherapy | (noun) therapy that uses physical agents: exercise and massage and other modalities | Synonyms: physiatrics, physical therapy |
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| phytotherapy | (noun) the use of plants or plant extracts for medicinal purposes (especially plants that are not part of the normal diet) | Synonyms: botanical medicine, herbal therapy |
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| poikilotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: ectotherm |
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| pother | (noun) an excited state of agitation | Synonyms: dither, flap, fuss, tizzy |
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| potherb | (noun) any of various herbaceous plants whose leaves or stems or flowers are cooked and used for food or seasoning | - |
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| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
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| psychotherapeutics | (noun) the branch of psychiatry concerned with psychological methods | Synonyms: mental hygiene, psychotherapy |
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| psychotherapist | (noun) a therapist who deals with mental and emotional disorders | Synonyms: clinical psychologist |
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| psychotherapy | (noun) the treatment of mental or emotional problems by psychological means | - |
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| (noun) the branch of psychiatry concerned with psychological methods | Synonyms: mental hygiene, psychotherapeutics |
| radiotherapist | (noun) a medical specialist who uses radioactive substances and X-rays in the treatment of disease | Synonyms: radiologist |
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| radiotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation, radiation therapy |
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| rutherford | (noun) a unit strength of a radioactive source equal to one million disintegrations per second | - |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| smithereens | (noun) a collection of small fragments considered as a whole | - |
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| smoother | (noun) a power tool used for sanding wood; an endless loop of sandpaper is moved at high speed by an electric motor | Synonyms: drum sander, electric sander, sander |
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| smother | (noun) a stifling cloud of smoke | - |
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| (noun) a confused multitude of things | Synonyms: clutter, fuddle, jumble, mare's nest, muddle, welter |
| smotherer | (noun) a person who stifles or smothers or suppresses | Synonyms: stifler |
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| souther | (noun) a wind from the south | Synonyms: south wind, southerly |
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| southerly | (noun) a wind from the south | Synonyms: south wind, souther |
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| southernism | (noun) an attitude characteristic of Southerners (especially in the US) | - |
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| (noun) a locution or pronunciation peculiar to the southern United States | - |
| southernness | (noun) the property of being to the south | - |
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| southernwood | (noun) shrubby European wormwood naturalized in North America; sometimes used in brewing beer | Synonyms: Artemisia abrotanum |
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| stepbrother | (noun) a brother who has only one parent in common with you | Synonyms: half-brother, half brother |
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| stepfather | (noun) the husband of your mother by a subsequent marriage | - |
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| stepmother | (noun) the wife of your father by a subsequent marriage | - |
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| sunbather | (noun) someone who basks in the sunshine in order to get a suntan | - |
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| swither | (noun) agitation resulting from active worry | Synonyms: fret, lather, stew, sweat |
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| telethermometer | (noun) a thermometer that registers the temperature at some distant point | - |
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| tether | (noun) restraint consisting of a rope (or light chain) used to restrain an animal | Synonyms: lead, leash |
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| tetherball | (noun) a game with two players who use rackets to strike a ball that is tethered to the top of a pole; the object is to wrap the string around the pole | - |
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| therapeutic | (noun) a medicine or therapy that cures disease or relieve pain | Synonyms: curative, cure, remedy |
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| therapeutics | (noun) branch of medicine concerned with the treatment of disease | - |
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| therapist | (noun) a person skilled in a particular type of therapy | Synonyms: healer |
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| therapsid | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: protomammal |
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| therapy | (noun) (medicine) the act of caring for someone (as by medication or remedial training etc.) | Synonyms: treatment |
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| there | (noun) a location other than here; that place; location, medial pronoun; demonstrative pronoun, location; quantifier: demonstrative determiner, distal; demonstrative pronoun, location; quantifier: demonstrative determiner, singular, distal | - |
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| theremin | (noun) an electronic musical instrument; melodies can be played by moving the right hand between two rods that serve as antennas to control pitch; the left hand controls phrasing | - |
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| thereness | (noun) the state of being there--not here--in position | - |
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| (noun) real existence | - |
| theridiid | (noun) spider having a comb-like row of bristles on each hind foot | Synonyms: comb-footed spider |
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| therm | (noun) a unit of heat equal to 100,000 British thermal units | - |
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| thermal | (noun) rising current of warm air | - |
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| thermalgesia | (noun) pain caused by heat | - |
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| thermel | (noun) a thermometer that uses thermoelectric current to measure temperature | Synonyms: electric thermometer, thermoelectric thermometer |
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| thermion | (noun) an electrically charged particle (electron or ion) emitted by a substance at a high temperature | - |
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| thermionics | (noun) the branch of electronics dealing with thermionic phenomena (especially thermionic vacuum tubes) | - |
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| thermistor | (noun) a semiconductor device made of materials whose resistance varies as a function of temperature; can be used to compensate for temperature variation in other components of a circuit | Synonyms: thermal resistor |
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| thermoacidophile | (noun) archaebacteria that thrive in strongly acidic environments at high temperatures | - |
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| thermocautery | (noun) cautery (destruction of tissue) by heat | - |
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| thermochemistry | (noun) the branch of chemistry that studies the relation between chemical action and the amount of heat absorbed or generated | - |
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| thermocoagulation | (noun) congealing tissue by heat (as by electric current) | - |
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| thermocompressor | (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, injector, steam ejector, steam injector |
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| thermocouple | (noun) a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference | Synonyms: thermocouple junction |
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| thermodynamics | (noun) the branch of physics concerned with the conversion of different forms of energy | - |
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| thermoelectricity | (noun) electricity produced by heat (as in a thermocouple) | - |
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| thermogram | (noun) a graphical record produced by a thermograph | - |
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| thermograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermometrograph |
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| (noun) medical instrument that uses an infrared camera to reveal temperature variations on the surface of the body | - |
| thermography | (noun) diagnostic technique using a thermograph to record the heat produced by different parts of the body; used to study blood flow and to detect tumors | - |
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| thermogravimeter | (noun) a hydrometer that includes a thermometer | Synonyms: thermohydrometer |
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| thermogravimetry | (noun) the measurement of changes in weight as a function of changes in temperature used as a technique of chemically analyzing substances | - |
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| thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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| thermojunction | (noun) a junction between two dissimilar metals across which a voltage appears | - |
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| thermometer | (noun) measuring instrument for measuring temperature | - |
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| thermometrograph | (noun) a thermometer that records temperature variations on a graph as a function of time | Synonyms: thermograph |
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| thermometry | (noun) the measurement of temperature | - |
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| thermopile | (noun) a kind of thermometer for measuring heat radiation; consists of several thermocouple junctions in series | - |
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| thermoplastic | (noun) a material that softens when heated and hardens again when cooled | Synonyms: thermoplastic resin |
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| thermoreceptor | (noun) a sensory receptor that responds to heat and cold | - |
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| thermoregulator | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermostat |
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| thermos | (noun) vacuum flask that preserves temperature of hot or cold drinks | Synonyms: thermos bottle, thermos flask |
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| thermosphere | (noun) the atmospheric layer between the mesosphere and the exosphere | - |
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| thermostat | (noun) a regulator for automatically regulating temperature by starting or stopping the supply of heat | Synonyms: thermoregulator |
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| thermostatics | (noun) the aspect of thermodynamics concerned with thermal equilibrium | Synonyms: thermodynamics of equilibrium |
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| thermotherapy | (noun) the use of heat to treat a disease or disorder; heating pads or hot compresses or hot-water bottles are used to promote circulation in peripheral vascular disease or to relax tense muscles | - |
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| thermotropism | (noun) an orienting response to warmth | - |
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| theropod | (noun) any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs | Synonyms: bird-footed dinosaur, theropod dinosaur |
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| tither | (noun) someone who pays tithes | - |
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| togetherness | (noun) affectionate closeness | - |
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| tollgatherer | (noun) someone employed to collect tolls | Synonyms: toll agent, toll collector, toll taker, toller, tollkeeper, tollman |
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| uintathere | (noun) a variety of dinocerate | Synonyms: dinoceras |
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| weather | (noun) the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation | Synonyms: atmospheric condition, conditions, weather condition |
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| weatherboard | (noun) the side toward the wind | Synonyms: weather side, windward side |
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| (noun) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below | Synonyms: clapboard, weatherboarding |