| hectoliter | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectolitre, hl |
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| hectolitre | (noun) a metric unit of volume or capacity equal to 100 liters | Synonyms: hectoliter, hl |
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| hemimetabolism | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetaboly, hemimetamorphosis |
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| heterometabolism | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometaboly |
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| holibut | (noun) marine food fish of the northern Atlantic or northern Pacific; the largest flatfish and one of the largest teleost fishes | Synonyms: halibut |
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| holiday | (noun) leisure time away from work devoted to rest or pleasure | Synonyms: vacation |
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| (noun) a day on which work is suspended by law or custom | - |
| holidaymaker | (noun) someone who travels for pleasure | Synonyms: tourer, tourist |
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| holiness | (noun) the quality of being holy | Synonyms: sanctitude, sanctity |
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| holism | (noun) the theory that the parts of any whole cannot exist and cannot be understood except in their relation to the whole | Synonyms: holistic theory |
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| holometabolism | (noun) complete metamorphosis in insects | Synonyms: holometaboly |
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| hooligan | (noun) a cruel and brutal fellow | Synonyms: bully, roughneck, rowdy, ruffian, tough, yob, yobbo, yobo |
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| hooliganism | (noun) willful wanton and malicious destruction of the property of others | Synonyms: malicious mischief, vandalism |
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| hydrolith | (noun) a saltlike binary compound (CaH2) used as a reducing agent and source of hydrogen | Synonyms: calcium hydride |
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| hydroxyproline | (noun) a crystalline amino acid obtained from gelatin or collagen | - |
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| hyperbolism | (noun) the use of hyperbole. | - |
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| hypolipoproteinemia | (noun) any of various disorders of lipoprotein and cholesterol metabolism that result in low levels of lipoprotein and cholesterol in the circulating blood | - |
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| idolisation | (noun) the act of worshiping blindly and to excess | Synonyms: idolization |
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| (noun) the act of admiring strongly | Synonyms: adoration, idolization |
| idoliser | (noun) a person who worships idols | Synonyms: idol worshiper, idolater, idolizer |
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| (noun) a lover blind with admiration and devotion | Synonyms: idolizer |
| idolization | (noun) the act of worshiping blindly and to excess | Synonyms: idolisation |
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| (noun) the act of admiring strongly | Synonyms: adoration, idolisation |
| idolizer | (noun) a person who worships idols | Synonyms: idol worshiper, idolater, idoliser |
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| (noun) a lover blind with admiration and devotion | Synonyms: idoliser |
| impoliteness | (noun) a discourteous manner that ignores accepted social usage | - |
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| kaoliang | (noun) sorghums of China and Manchuria having small white or brown grains (used for food) and dry pithy stalks (used for fodder, fuel and thatching) | - |
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| kaolin | (noun) a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper) | Synonyms: china clay, china stone, kaoline, porcelain clay, terra alba |
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| kaoline | (noun) a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper) | Synonyms: china clay, china stone, kaolin, porcelain clay, terra alba |
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| kaolinite | (noun) a mineral consisting of aluminum silicate; main source of kaolin | - |
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| katabolism | (noun) breakdown in living organisms of more complex substances into simpler ones together with release of energy | Synonyms: catabolism, destructive metabolism, dissimilation |
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| kiloliter | (noun) a metric unit of volume or capacity equal to 1000 liters | Synonyms: cubic meter, cubic metre, kilolitre |
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| kilolitre | (noun) a metric unit of volume or capacity equal to 1000 liters | Synonyms: cubic meter, cubic metre, kiloliter |
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| lanolin | (noun) an emollient containing wool fat (a fatty substance obtained from the wool of sheep) | - |
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| (noun) a yellow viscous animal oil extracted from wool; a mixture of fatty acids and esters; used in some ointments and cosmetics | Synonyms: wool fat, wool grease |
| lepidolite | (noun) a mineral of the mica group; an important source of lithium | - |
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| loligo | (noun) somewhat flattened cylindrical squid | - |
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| magnolia | (noun) any shrub or tree of the genus Magnolia; valued for their longevity and exquisite fragrant blooms | - |
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| (noun) dried bark of various magnolias; used in folk medicine | - |
| magnoliopsid | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, exogen |
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| maiolica | (noun) highly decorated earthenware with a glaze of tin oxide | Synonyms: majolica |
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| majolica | (noun) highly decorated earthenware with a glaze of tin oxide | Synonyms: maiolica |
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| mandolin | (noun) a stringed instrument related to the lute, usually played with a plectrum | - |
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| megalopolis | (noun) a very large urban complex (usually involving several cities and towns) | - |
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| melancholia | (noun) extreme depression characterized by tearful sadness and irrational fears | - |
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| melancholiac | (noun) someone subject to melancholia | Synonyms: melancholic |
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| melancholic | (noun) someone subject to melancholia | Synonyms: melancholiac |
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| metabolism | (noun) the organic processes (in a cell or organism) that are necessary for life | Synonyms: metabolic process |
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| (noun) the marked and rapid transformation of a larva into an adult that occurs in some animals | Synonyms: metamorphosis |
| metabolite | (noun) any substance involved in metabolism (either as a product of metabolism or as necessary for metabolism) | - |
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| methacholine | (noun) parasympathomimetic drug (trademark Mecholyl) that stimulates secretions and smooth muscle activity | Synonyms: Mecholyl |
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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 |
| metropolitan | (noun) a person who lives in a metropolis | - |
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| (noun) in the Eastern Orthodox Church this title is given to a position between bishop and patriarch; equivalent to archbishop in western Christianity | - |
| molindone | (noun) antipsychotic drug (trade name Moban) used in the treatment of schizophrenia | Synonyms: Moban |
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| mongolianism | (noun) a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation | Synonyms: Down's syndrome, Down syndrome, mongolism, trisomy 21 |
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| mongolism | (noun) a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation | Synonyms: Down's syndrome, Down syndrome, mongolianism, trisomy 21 |
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| monolingual | (noun) a person who knows only one language | - |
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| monolith | (noun) a single great stone (often in the form of a column or obelisk) | - |
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| monopolisation | (noun) domination (of a market or commodity) to the exclusion of others | Synonyms: monopolization |
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| monopoliser | (noun) someone who monopolizes the means of producing or selling something | Synonyms: monopolist, monopolizer |
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| monopolist | (noun) someone who monopolizes the means of producing or selling something | Synonyms: monopoliser, monopolizer |
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| monopolization | (noun) domination (of a market or commodity) to the exclusion of others | Synonyms: monopolisation |
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| monopolizer | (noun) someone who monopolizes the means of producing or selling something | Synonyms: monopoliser, monopolist |
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| mostaccioli | (noun) pasta somewhat resembling little moustaches | - |
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| naphazoline | (noun) vasoconstrictor (trade names Privine and Sudafed) used in nasal sprays to treat symptoms of nasal congestion and in eyedrops to treat eye irritation | Synonyms: Privine, Sudafed |
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| natrolite | (noun) a group of minerals of the zeolite family consisting of a hydrous silicate of sodium and aluminum | - |
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| necropolis | (noun) a tract of land used for burials | Synonyms: burial ground, burial site, burying ground, cemetery, graveyard, memorial park |
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| neoliberal | (noun) a liberal who subscribes to neoliberalism | - |
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| neoliberalism | (noun) a political orientation originating in the 1960s; blends liberal political views with an emphasis on economic growth | - |
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| neolith | (noun) a stone tool from the Neolithic Age | - |
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| nephrolith | (noun) a calculus formed in the kidney | Synonyms: kidney stone, renal calculus, urinary calculus |
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| nephrolithiasis | (noun) the presence of kidney stones (calculi) in the kidney | Synonyms: renal lithiasis |
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| neurolinguist | (noun) someone trained in neuroscience and linguistics who studies brain processes during language production and reception | - |
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| neurolinguistics | (noun) the branch of linguistics that studies the relation between language and the structure and function of the nervous system | - |
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| nonproliferation | (noun) the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons) | Synonyms: non-proliferation |
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| olibanum | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, thus |
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| oligarch | (noun) one of the rulers in an oligarchy | - |
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| oligarchy | (noun) a political system governed by a few people | - |
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| oligo | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligonucleotide |
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| oligochaete | (noun) hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body | Synonyms: oligochaete worm |
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| oligoclase | (noun) any of a series of triclinic feldspars that form rocks | Synonyms: plagioclase |
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| oligodactyly | (noun) congenital condition in which some fingers or toes are missing | - |
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| oligodendria | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendroglia |
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| oligodendrocyte | (noun) a cell of the oligodendroglia | - |
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| oligodendroglia | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendria |
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| oligodontia | (noun) congenital condition in which some of the teeth are missing | - |
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| oligomenorrhea | (noun) abnormally light or infrequent menstruation | - |
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| oligonucleotide | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligo |
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| oligopoly | (noun) (economics) a market in which control over the supply of a commodity is in the hands of a small number of producers and each one can influence prices and affect competitors | - |
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| oligosaccharide | (noun) any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis | - |
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| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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| oliguria | (noun) production of an abnormally small amount of urine | - |
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| (noun) abnormally small production of urine; can be a symptom of kidney disease or obstruction of the urinary tract or edema or an imbalance of fluids and electrolytes in the body | - |
| olive | (noun) a yellow-green color of low brightness and saturation | - |
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| (noun) one-seeded fruit of the European olive tree usually pickled and used as a relish | - |
| (noun) evergreen tree cultivated in the Mediterranean region since antiquity and now elsewhere; has edible shiny black fruits | Synonyms: European olive tree, Olea europaea |
| (noun) small ovoid fruit of the European olive tree; important food and source of oil | - |
| (noun) hard yellow often variegated wood of an olive tree; used in cabinetwork | - |
| olivenite | (noun) rare green to black mineral consisting of hydrated copper arsenate that is found in copper deposits | - |
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| olivine | (noun) a mineral consisting of magnesium iron silicate; a source of magnesium | - |
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| paleolith | (noun) a stone tool from the Paleolithic age | - |
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| pangolin | (noun) toothless mammal of southern Africa and Asia having a body covered with horny scales and a long snout for feeding on ants and termites | Synonyms: anteater, scaly anteater |
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| phenolic | (noun) a thermosetting resin | Synonyms: phenolic resin, phenoplast |
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| phospholipid | (noun) any of various compounds composed of fatty acids and phosphoric acid and a nitrogenous base; an important constituent of membranes | - |
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| photolithograph | (noun) a lithograph produced by photographically produced plates | - |
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| photolithography | (noun) a planographic printing process using plates made from a photographic image | - |
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| pigeonholing | (noun) a system for classifying things into groups | Synonyms: grouping |
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| pignolia | (noun) edible seed of any of several nut pines especially some pinons of southwestern North America | Synonyms: pine nut, pinon nut |
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| police | (noun) the force of policemen and officers | Synonyms: constabulary, law, police force |
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| policeman | (noun) a male member of a police force | - |
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| policewoman | (noun) a woman policeman | Synonyms: police matron |
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| policy | (noun) a plan of action adopted by an individual or social group | - |
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| (noun) a line of argument rationalizing the course of action of a government | - |
| (noun) written contract or certificate of insurance | Synonyms: insurance, insurance policy |
| policyholder | (noun) a person who holds an insurance policy; usually, the client in whose name an insurance policy is written | - |
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