| greenockite | (noun) ore of cadmium; a rare yellowish mineral consisting of cadmium sulphide in crystalline form | Synonyms: cadmium sulphide |
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| guesstimate | (noun) an estimate that combines reasoning with guessing | Synonyms: guestimate |
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| guestimate | (noun) an estimate that combines reasoning with guessing | Synonyms: guesstimate |
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| gummite | (noun) a gummy orange mixture of uranium oxides and silicates occurring naturally in the hydration and oxidation of pitchblende | - |
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| gunite | (noun) a mixture of cement and sand and water that is sprayed on a surface under pneumatic pressure | - |
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| haematite | (noun) the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form | Synonyms: hematite |
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| halite | (noun) naturally occurring crystalline sodium chloride | Synonyms: rock salt |
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| halophyte | (noun) plant growing naturally in very salty soil | - |
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| hamate | (noun) the wrist bone in line with the 4th and 5th fingers | Synonyms: hamate bone, os hamatum, unciform bone |
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| haste | (noun) the act of moving hurriedly and in a careless manner | Synonyms: hurry, rush, rushing |
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| (noun) overly eager speed (and possible carelessness) | Synonyms: hastiness, hurriedness, hurry, precipitation |
| (noun) a condition of urgency making it necessary to hurry | Synonyms: hurry |
| hate | (noun) the emotion of intense dislike; a feeling of dislike so strong that it demands action | Synonyms: hatred |
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| hausmannite | (noun) a mineral consisting of manganese tetroxide; a source of manganese | - |
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| hellgrammiate | (noun) large brown aquatic larva of the dobsonfly; used as fishing bait | Synonyms: dobson |
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| helpmate | (noun) a helpful partner | Synonyms: helpmeet |
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| hematite | (noun) the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form | Synonyms: haematite |
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| hemiepiphyte | (noun) a plant that is an epiphyte for part of its life | Synonyms: semiepiphyte |
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| hemimorphite | (noun) a white mineral; a common ore of zinc | Synonyms: calamine |
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| hemiparasite | (noun) a parasitic plant that contains some chlorophyll and therefore is capable of photosynthesis | Synonyms: semiparasite |
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| hermaphrodite | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene, epicene person, gynandromorph, intersex |
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| hessonite | (noun) a garnet ranging in color from yellow to brown | Synonyms: cinnamon stone, essonite |
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| heterozygote | (noun) (genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring | - |
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| heulandite | (noun) a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium | - |
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| hiddenite | (noun) a green transparent form of the mineral spodumene used as a gemstone | - |
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| histiocyte | (noun) a macrophage that is found in connective tissue | - |
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| holophyte | (noun) an organism that produces its own food by photosynthesis | - |
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| homogenate | (noun) material that has been homogenized (especially tissue that has been ground and mixed) | - |
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| homozygote | (noun) (genetics) an organism having two identical alleles of a particular gene and so breeding true for the particular characteristic | - |
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| hotplate | (noun) a portable electric appliance for heating or cooking or keeping food warm | Synonyms: hot plate |
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| housemate | (noun) someone who resides in the same house with you | - |
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| humate | (noun) material that is high in humic acids | - |
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| hydrate | (noun) any compound that contains water of crystallization | - |
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| hydrazoite | (noun) a salt of hydrazoic acid | - |
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| hydrolysate | (noun) a product of hydrolysis | - |
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| hydrophyte | (noun) a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth | Synonyms: aquatic plant, hydrophytic plant, water plant |
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| hygrophyte | (noun) a plant that grows in a moist habitat | - |
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| hypermastigote | (noun) flagellate symbiotic in the intestines of e.g. termites | - |
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| hypochlorite | (noun) any salt or ester of hypochlorous acid | - |
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| hypocrite | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissembler, dissimulator, phoney, phony, pretender |
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| illegitimate | (noun) the illegitimate offspring of unmarried parents | Synonyms: bastard, by-blow, illegitimate child, love child, whoreson |
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| illiterate | (noun) a person unable to read | Synonyms: illiterate person, nonreader |
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| ilmenite | (noun) a weakly magnetic black mineral found in metamorphic and plutonic rocks; an iron titanium oxide in crystalline form; a source of titanium | - |
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| inebriate | (noun) a chronic drinker | Synonyms: drunk, drunkard, rummy, sot, wino |
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| infinite | (noun) the unlimited expanse in which everything is located | Synonyms: space |
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| ingrate | (noun) a person who shows no gratitude | Synonyms: thankless wretch, ungrateful person |
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| initiate | (noun) people who have been introduced to the mysteries of some field or activity | Synonyms: enlightened |
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| (noun) someone who has been admitted to membership in a scholarly field | Synonyms: learned person, pundit, savant |
| (noun) someone new to a field or activity | Synonyms: beginner, novice, tiro, tyro |
| inmate | (noun) one of several resident of a dwelling (especially someone confined to a prison or hospital) | - |
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| (noun) a patient who is residing in the hospital where he is being treated | Synonyms: inpatient |
| (noun) a person serving a sentence in a jail or prison | Synonyms: con, convict, yard bird, yardbird |
| inspectorate | (noun) a body of inspectors | - |
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| institute | (noun) an association organized to promote art or science or education | - |
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| intermediate | (noun) a substance formed during a chemical process before the desired product is obtained | - |
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| interstate | (noun) one of the system of highways linking major cities in the 48 contiguous states of the United States | Synonyms: interstate highway |
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| intimate | (noun) someone to whom private matters are confided | Synonyms: confidant |
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| invertebrate | (noun) any animal lacking a backbone or notochord; the term is not used as a scientific classification | - |
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| invite | (noun) a colloquial expression for invitation | - |
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| isocyanate | (noun) a salt or ester of isocyanic acid | - |
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| isogamete | (noun) either of a pair of conjugating gametes of the same size and structure | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| jadeite | (noun) a hard green mineral consisting of sodium aluminum silicate in monoclinic crystalline form; a source of jade; found principally in Burma | - |
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| jocote | (noun) common tropical American shrub or small tree with purplish fruit | Synonyms: mombin, mombin tree, Spondias purpurea |
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| jute | (noun) a plant fiber used in making rope or sacks | - |
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| kainite | (noun) a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer | - |
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| kaolinite | (noun) a mineral consisting of aluminum silicate; main source of kaolin | - |
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| karate | (noun) a traditional Japanese system of unarmed combat; sharp blows and kicks are given to pressure-sensitive points on the body of the opponent | - |
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| kerite | (noun) a compound in which tar or asphalt combined with animal or vegetable oils is vulcanized by sulphur, the product closely resembling rubber. | - |
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| kernite | (noun) a light soft mineral consisting of hydrated sodium borate in crystalline form; an important source of boron | - |
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| keynote | (noun) a fundamental or central idea | - |
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| (noun) (music) the first note of a diatonic scale | Synonyms: tonic |
| (noun) the principal theme in a speech or literary work | - |
| khanate | (noun) the position of a khan | - |
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| (noun) the realm of a khan | - |
| kibibyte | (noun) a unit of information equal to 1024 bytes | Synonyms: K, kB, KB, KiB, kilobyte |
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| kieserite | (noun) a white mineral consisting of hydrous magnesium sulfate often found in salt mines | - |
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| kilobyte | (noun) a unit of information equal to 1024 bytes | Synonyms: K, kB, KB, KiB, kibibyte |
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| (noun) a unit of information equal to 1000 bytes | Synonyms: K, kB, KB |
| kimberlite | (noun) a rare type of peridotite that sometimes contains diamonds; found in South Africa and Siberia | - |
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| kitchenette | (noun) small kitchen | - |
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| kite | (noun) any of several small graceful hawks of the family Accipitridae having long pointed wings and feeding on insects and small animals | - |
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| (noun) plaything consisting of a light frame covered with tissue paper; flown in wind at end of a string | - |
| (noun) a bank check drawn on insufficient funds at another bank in order to take advantage of the float | - |
| (noun) a bank check that has been fraudulently altered to increase its face value | - |
| krennerite | (noun) an orthorhombic gold telluride mineral which can contain a relatively small amount of silver in the structure. | - |
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| kunzite | (noun) a pinkish lilac crystal form of the mineral spodumene that is used as a gemstone | - |
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| kyanite | (noun) a grey or greenish-blue mineral consisting of aluminum silicate in crystalline form; occurs in metaphoric rock, used as a refractory | Synonyms: cyanite |
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| labrocyte | (noun) a large connective tissue cell that contains histamine and heparin and serotonin which are released in allergic reactions or in response to injury or inflammation | Synonyms: mast cell, mastocyte |
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| lactate | (noun) a salt or ester of lactic acid | - |
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| laminate | (noun) a sheet of material made by bonding two or more sheets or layers | - |
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| langbeinite | (noun) a mineral consisting of potassium magnesium double sulphate; used as a fertilizer | - |
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| langouste | (noun) large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters | Synonyms: crawfish, crayfish, rock lobster, sea crawfish, spiny lobster |
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| (noun) warm-water lobsters without claws; those from Australia and South Africa usually marketed as frozen tails; caught also in Florida and California | Synonyms: crayfish, rock lobster, spiny lobster |
| laterite | (noun) a red soil produced by rock decay; contains insoluble deposits of ferric and aluminum oxides | - |
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| latte | (noun) strong espresso coffee with a topping of frothed steamed milk | Synonyms: caffe latte |
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| launderette | (noun) a self-service laundry (service mark Laundromat) where coin-operated washing machines are available to individual customers | Synonyms: Laundromat |
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| laureate | (noun) someone honored for great achievements; figuratively someone crowned with a laurel wreath | - |
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| layette | (noun) kit consisting of a complete outfit (clothing and accessories) for a new baby | - |
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| lazarette | (noun) hospital for persons with infectious diseases (especially leprosy) | Synonyms: lazar house, lazaret, lazaretto, pesthouse |
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| leatherette | (noun) fabric made to look like leather | Synonyms: imitation leather |
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| lechatelierite | (noun) colorless glass made of almost pure silica | Synonyms: crystal, quartz, quartz glass, vitreous silica |
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| legate | (noun) a member of a legation | Synonyms: official emissary |
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| lemniscate | (noun) any of several plane algebraic curves in the shape of a figure eight | - |
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| lepidocrocite | (noun) a red to reddish brown mineral consisting of iron oxide hydroxide; often found in iron ores together with goethite | - |
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| lepidolite | (noun) a mineral of the mica group; an important source of lithium | - |
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| leucocyte | (noun) blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system | Synonyms: leukocyte, WBC, white blood cell, white blood corpuscle, white cell, white corpuscle |
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| leukocyte | (noun) blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system | Synonyms: leucocyte, WBC, white blood cell, white blood corpuscle, white cell, white corpuscle |
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| levirate | (noun) the biblical institution whereby a man must marry the widow of his childless brother in order to maintain the brother's line | - |
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| licentiate | (noun) holds a license (degree) from a (European) university | - |
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| lichgate | (noun) a roofed gate to a churchyard, formerly used as a temporary shelter for the bier during funerals | Synonyms: lychgate |
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| liftgate | (noun) a sloping rear car door that is lifted to open | Synonyms: hatch, hatchback, hatchback door |
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| lignite | (noun) intermediate between peat and bituminous coal | Synonyms: brown coal, wood coal |
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| limonite | (noun) a widely occurring iron oxide ore; a mixture of goethite and hematite and lepidocrocite | - |
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