| abelmosk | (noun) bushy herb of tropical Asia grown for its yellow or pink to scarlet blooms that resemble the hibiscus | Synonyms: Abelmoschus moschatus, Hibiscus moschatus, musk mallow |
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| anaplasmosis | (noun) a disease of cattle that is transmitted by cattle ticks; similar to Texas fever | - |
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| anastomosis | (noun) a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous | Synonyms: inosculation |
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| animosity | (noun) a feeling of ill will arousing active hostility | Synonyms: animus, bad blood |
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| atmosphere | (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, aura |
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| (noun) the mass of air surrounding the Earth | Synonyms: air |
| (noun) the envelope of gases surrounding any celestial body | - |
| (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atm, standard atmosphere, standard pressure |
| (noun) the weather or climate at some place | Synonyms: atmospheric state |
| (noun) a particular environment or surrounding influence | Synonyms: ambiance, ambience |
| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| camosh | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camass, quamash |
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| chamosite | (noun) a greenish grey or black silicate of iron and aluminum | - |
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| chemosis | (noun) edema of the mucous membrane of the eyeball and eyelid lining | - |
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| chemosorption | (noun) adsorption (especially when irreversible) by means of chemical instead of physical forces | Synonyms: chemisorption |
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| chemosurgery | (noun) use of chemical to destroy diseased or malignant tissue; used in treatment of skin cancer | - |
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| chemosynthesis | (noun) synthesis of carbohydrate from carbon dioxide and water; limited to certain bacteria and fungi | - |
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| chromosome | (noun) a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order | - |
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| chromosphere | (noun) a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun | - |
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| chymosin | (noun) an enzyme that occurs in gastric juice; causes milk to coagulate | Synonyms: rennin |
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| cosmos | (noun) everything that exists anywhere | Synonyms: creation, existence, macrocosm, universe, world |
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| (noun) any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals | Synonyms: cosmea |
| damosel | (noun) a young unmarried woman | Synonyms: damoiselle, damozel, damsel, demoiselle |
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| ditchmoss | (noun) submerged freshwater perennials | Synonyms: Elodea, genus Elodea, pondweed |
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| ecchymosis | (noun) the escape of blood from ruptured blood vessels into the surrounding tissue to form a purple or black-and-blue spot on the skin | - |
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| (noun) the purple or black-and-blue area resulting from a bruise | - |
| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| gummosis | (noun) pathological production of gummy exudates in citrus and various stone-fruit trees | - |
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| (noun) disease of citrus trees caused by the fungus Phytophthora citrophthora | Synonyms: brown rot gummosis |
| haemosiderin | (noun) a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism | Synonyms: hemosiderin |
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| haemosiderosis | (noun) abnormal deposit of hemosiderin; often a symptom of thalassemia or hemochromatosis | Synonyms: hemosiderosis |
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| haemosporidian | (noun) minute protozoans parasitic at some stage of the life cycle in blood cells of vertebrates including many pathogens | - |
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| haemostasia | (noun) surgical procedure of stopping the flow of blood (as with a hemostat) | Synonyms: haemostasis, hemostasia, hemostasis |
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| haemostasis | (noun) surgical procedure of stopping the flow of blood (as with a hemostat) | Synonyms: haemostasia, hemostasia, hemostasis |
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| haemostat | (noun) a surgical instrument that stops bleeding by clamping the blood vessel | Synonyms: hemostat |
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| hemosiderin | (noun) a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism | Synonyms: haemosiderin |
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| hemosiderosis | (noun) abnormal deposit of hemosiderin; often a symptom of thalassemia or hemochromatosis | Synonyms: haemosiderosis |
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| hemostasia | (noun) surgical procedure of stopping the flow of blood (as with a hemostat) | Synonyms: haemostasia, haemostasis, hemostasis |
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| hemostasis | (noun) surgical procedure of stopping the flow of blood (as with a hemostat) | Synonyms: haemostasia, haemostasis, hemostasia |
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| hemostat | (noun) a surgical instrument that stops bleeding by clamping the blood vessel | Synonyms: haemostat |
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| hommos | (noun) a thick spread made from mashed chickpeas, tahini, lemon juice and garlic; used especially as a dip for pita; originated in the Middle East | Synonyms: hoummos, hummus, humous, humus |
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| homosexual | (noun) someone who is sexually attracted to persons of the same sex | Synonyms: gay, homo, homophile |
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| homosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homoeroticism, homosexuality, queerness |
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| homosexuality | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homoeroticism, homosexualism, queerness |
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| homospory | (noun) the development of a single kind of asexual spores | - |
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| hoummos | (noun) a thick spread made from mashed chickpeas, tahini, lemon juice and garlic; used especially as a dip for pita; originated in the Middle East | Synonyms: hommos, hummus, humous, humus |
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| lagophthalmos | (noun) abnormal condition in which an eye cannot close completely | - |
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| marmoset | (noun) small soft-furred South American and Central American monkey with claws instead of nails | - |
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| mimosa | (noun) a mixed drink containing champagne and orange juice | Synonyms: buck's fizz |
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| (noun) any of various tropical shrubs or trees of the genus Mimosa having usually yellow flowers and compound leaves | - |
| (noun) evergreen Australasian tree having white or silvery bark and young leaves and yellow flowers | Synonyms: Acacia dealbata, silver wattle |
| mosaic | (noun) art consisting of a design made of small pieces of colored stone or glass | - |
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| (noun) arrangement of aerial photographs forming a composite picture | Synonyms: arial mosaic, photomosaic |
| (noun) transducer formed by the light-sensitive surface on a television camera tube | - |
| (noun) a pattern resembling a mosaic | - |
| (noun) viral disease in solanaceous plants (tomatoes, potatoes, tobacco) resulting in mottling and often shriveling of the leaves | - |
| mosaicism | (noun) the condition in which an organism has two or more cell populations that differ in genetic makeup | - |
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| moshav | (noun) a cooperative Israeli village or settlement comprised of small farms | - |
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| mosque | (noun) (Islam) a Muslim place of worship that usually has a minaret | - |
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| mosquito | (noun) two-winged insect whose female has a long proboscis to pierce the skin and suck the blood of humans and animals | - |
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| mosquitofish | (noun) silvery topminnow with rows of black spots of tropical North America and West Indies; important in mosquito control | Synonyms: Gambusia affinis |
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| moss | (noun) tiny leafy-stemmed flowerless plants | - |
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| mossback | (noun) an extremely old-fashioned conservative | - |
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| mostaccioli | (noun) pasta somewhat resembling little moustaches | - |
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| nanophthalmos | (noun) condition in which both eyes are abnormally small but otherwise normal | - |
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| ophthalmoscope | (noun) medical instrument for examining the retina of the eye | - |
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| ophthalmoscopy | (noun) examination of the interior of an eye using an ophthalmoscope | - |
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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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| phimosis | (noun) an abnormal tightness of the foreskin preventing retraction over the glans | - |
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| photomosaic | (noun) arrangement of aerial photographs forming a composite picture | Synonyms: arial mosaic, mosaic |
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| samosa | (noun) small turnover of Indian origin filled with vegetables or meat and fried and served hot | - |
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| seismosaur | (noun) huge herbivorous dinosaur of the Cretaceous found in western North America | Synonyms: ground-shaker |
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| spikemoss | (noun) any of numerous fern allies of the genus Selaginella | Synonyms: little club moss, spike moss |
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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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| thymosin | (noun) hormone secreted by the thymus; stimulates immunological activity of lymphoid tissue | - |
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| toxoplasmosis | (noun) infection caused by parasites transmitted to humans from infected cats; if contracted by a pregnant woman it can result in serious damage to the fetus | - |
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| utmost | (noun) the greatest possible degree | Synonyms: level best, maximum, uttermost |
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| uttermost | (noun) the greatest possible degree | Synonyms: level best, maximum, utmost |
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| zymosis | (noun) (medicine) the development and spread of an infectious disease (especially one caused by a fungus) | - |
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| (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, fermenting, zymolysis |