| furosemide | (noun) commonly used diuretic (trade name Lasix) used to treat hypertension and edema | Synonyms: Lasix |
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| gadoid | (noun) a soft-finned fish of the family Gadidae | Synonyms: gadoid fish |
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| ganoid | (noun) primitive fishes having thick bony scales with a shiny covering | Synonyms: ganoid fish |
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| gelechiid | (noun) small slender-winged moths whose larvae are agricultural pests | Synonyms: gelechiid moth |
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| gelidity | (noun) coldness due to a cold environment | Synonyms: chill, iciness |
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| gempylid | (noun) snake mackerels; elongated marine fishes with oily flesh; resembles mackerels; found worldwide | - |
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| genocide | (noun) systematic killing of a racial or cultural group | Synonyms: race murder, racial extermination |
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| geometrid | (noun) slender-bodied broad-winged moth whose larvae are called measuring worms | Synonyms: geometrid moth |
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| germicide | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, antimicrobic, disinfectant |
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| giddiness | (noun) an impulsive scatterbrained manner | Synonyms: silliness |
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| (noun) a reeling sensation; a feeling that you are about to fall | Synonyms: dizziness, lightheadedness, vertigo |
| gidgee | (noun) scrubby Australian acacia having extremely foul-smelling blossoms | Synonyms: Acacia cambegei, stinking wattle |
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| glide | (noun) the act of moving smoothly along a surface while remaining in contact with it | Synonyms: coast, slide |
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| (noun) the activity of flying a glider | Synonyms: gliding, sailing, sailplaning, soaring |
| (noun) a vowellike sound that serves as a consonant | Synonyms: semivowel |
| glider | (noun) aircraft supported only by the dynamic action of air against its surfaces | Synonyms: sailplane |
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| gliding | (noun) the activity of flying a glider | Synonyms: glide, sailing, sailplaning, soaring |
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| glipizide | (noun) an oral antidiabetic drug (trade name Glucotrol) that stimulates the release of insulin from the pancreas | Synonyms: Glucotrol |
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| gliricidia | (noun) any of several small deciduous trees valued for their dark wood and dense racemes of nectar-rich pink flowers grown in great profusion on arching branches; roots and bark and leaves and seeds are poisonous | - |
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| glochid | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochidium |
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| glochidium | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochid |
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| glucocorticoid | (noun) a steroid hormone that is produced by the adrenal cortex of animals; affects functioning of gonads and has anti-inflammatory activity | - |
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| glucoside | (noun) a glycoside derived from glucose | - |
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| glutethimide | (noun) sedative (trade name Doriden) used to treat some sleep disorders | Synonyms: Doriden |
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| glyburide | (noun) an oral antidiabetic drug (trade names DiaBeta and Micronase) that stimulates the release of insulin from the pancreas | Synonyms: DiaBeta, Micronase |
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| glyceride | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: acylglycerol |
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| glycoside | (noun) a group of compounds derived from monosaccharides | - |
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| gracilariid | (noun) small dull or metallic-colored tineoid moths whose larvae mine in plant leaves | Synonyms: gracilariid moth |
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| gramicidin | (noun) an antibiotic produced by a soil bacterium; used chiefly as an antiseptic in treating local infections produced by Gram-positive bacteria | - |
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| gravida | (noun) a pregnant woman | - |
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| (noun) the number of the pregnancy that a woman is in | - |
| gravidation | (noun) technical terms for pregnancy | Synonyms: gravidity, gravidness |
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| gravidity | (noun) technical terms for pregnancy | Synonyms: gravidation, gravidness |
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| gravidness | (noun) technical terms for pregnancy | Synonyms: gravidation, gravidity |
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| grid | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: gridiron |
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| (noun) an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube | Synonyms: control grid |
| (noun) a system of high tension cables by which electrical power is distributed throughout a region | Synonyms: power grid, power system |
| (noun) a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material | Synonyms: storage-battery grid |
| (noun) a pattern of regularly spaced horizontal and vertical lines | - |
| griddle | (noun) cooking utensil consisting of a flat heated surface (as on top of a stove) on which food is cooked | - |
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| griddlecake | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: battercake, flannel-cake, flannel cake, flapcake, flapjack, hot cake, hotcake, pancake |
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| (noun) a scone made by dropping a spoonful of batter on a griddle | Synonyms: drop scone, Scotch pancake |
| gridiron | (noun) a cooking utensil of parallel metal bars; used to grill fish or meat | Synonyms: grid |
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| (noun) the playing field on which football is played | Synonyms: football field |
| gridlock | (noun) a traffic jam so bad that no movement is possible | - |
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| gueridon | (noun) a small round table | - |
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| guidance | (noun) the act of setting and holding a course | Synonyms: direction, steering |
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| (noun) the act of guiding or showing the way | Synonyms: steering |
| (noun) something that provides direction or advice as to a decision or course of action | Synonyms: counsel, counseling, counselling, direction |
| guide | (noun) a structure or marking that serves to direct the motion or positioning of something | - |
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| (noun) a model or standard for making comparisons | Synonyms: template, templet |
| (noun) something that offers basic information or instruction | Synonyms: guidebook |
| (noun) someone employed to conduct others | Synonyms: usher |
| (noun) someone who can find paths through unexplored territory | Synonyms: pathfinder, scout |
| (noun) someone who shows the way by leading or advising | - |
| guidebook | (noun) something that offers basic information or instruction | Synonyms: guide |
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| guideline | (noun) a rule or principle that provides guidance to appropriate behavior | Synonyms: guidepost, rule of thumb |
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| (noun) a detailed plan or explanation to guide you in setting standards or determining a course of action | Synonyms: road map |
| (noun) a light line that is used in lettering to help align the letters | - |
| guidepost | (noun) a rule or principle that provides guidance to appropriate behavior | Synonyms: guideline, rule of thumb |
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| (noun) a post bearing a sign that gives directions or shows the way | Synonyms: signpost |
| guideword | (noun) a word printed at the top of the page of a dictionary or other reference book to indicate the first or last item on that page | Synonyms: catchword, guide word |
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| haematoidin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: bilirubin, hematoidin |
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| haemoproteid | (noun) related to malaria parasite and having a phase in the viscera of various birds | - |
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| haemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: hemorrhoid, piles |
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| haemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: hemorrhoidectomy |
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| 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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| halide | (noun) a salt of any halogen acid | - |
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| haloperidol | (noun) tranquilizer (trade name Haldol) used to treat some psychotic disorders and Tourette's syndrome | Synonyms: Haldol |
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| handmaid | (noun) a personal maid or female attendant | Synonyms: handmaiden |
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| (noun) in a subordinate position | Synonyms: handmaiden, servant |
| handmaiden | (noun) a personal maid or female attendant | Synonyms: handmaid |
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| (noun) in a subordinate position | Synonyms: handmaid, servant |
| haploid | (noun) (genetics) an organism or cell having only one complete set of chromosomes | - |
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| haploidy | (noun) the condition of being haploid | - |
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| haplosporidian | (noun) parasite in invertebrates and lower vertebrates of no known economic importance | - |
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| harridan | (noun) a scolding (even vicious) old woman | - |
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| hematoidin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: bilirubin, haematoidin |
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| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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| hemidemisemiquaver | (noun) a musical note having the time value of a sixty-fourth of a whole note | Synonyms: sixty-fourth note |
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| hemidrachm | (noun) an ancient Greek silver coin equal to 1/2 drachm or 3 obols in value. | - |
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| hemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: haemorrhoid, piles |
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| hemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: haemorrhoidectomy |
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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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| herbicide | (noun) a chemical agent that destroys plants or inhibits their growth | Synonyms: weed killer, weedkiller |
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| heteroploid | (noun) (genetics) an organism or cell having a chromosome number that is not an even multiple of the haploid chromosome number for that species | - |
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| heteroploidy | (noun) the condition of being heteroploid | - |
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| hiddenite | (noun) a green transparent form of the mineral spodumene used as a gemstone | - |
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| hiddenness | (noun) the state of being covert and hidden | Synonyms: covertness |
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| hide | (noun) body covering of a living animal | Synonyms: pelt, skin |
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| (noun) the dressed skin of an animal (especially a large animal) | Synonyms: fell |
| hideaway | (noun) an area where you can be alone | Synonyms: retreat |
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| (noun) a hiding place; usually a remote place used by outlaws | Synonyms: den, hideout |
| hideousness | (noun) dreadful ugliness; horrible repulsiveness | - |
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| hideout | (noun) a hiding place; usually a remote place used by outlaws | Synonyms: den, hideaway |
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| hiding | (noun) the activity of keeping something secret | Synonyms: concealing, concealment |
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| (noun) the state of being hidden | - |
| hidrosis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: diaphoresis, perspiration, sudation, sweating |
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| hillside | (noun) the side or slope of a hill | - |
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| hippoboscid | (noun) bloodsucking dipterous fly parasitic on birds and mammals | Synonyms: louse fly |
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| histidine | (noun) an essential amino acid found in proteins that is important for the growth and repair of tissue | - |
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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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| homicide | (noun) the killing of a human being by another human being | - |
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| hominid | (noun) a primate of the family Hominidae | - |
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| hominoid | (noun) a primate of the superfamily Hominoidea | - |
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| horridness | (noun) a quality of extreme unpleasantness | Synonyms: awfulness, dreadfulness, terribleness |
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| horsehide | (noun) leather from the hide of a horse | - |
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| housemaid | (noun) a female domestic | Synonyms: amah, maid, maidservant |
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| humanoid | (noun) an automaton that resembles a human being | Synonyms: android, mechanical man |
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| humidifier | (noun) an appliance designed to add moisture to the air in a building | - |
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| humidity | (noun) wetness in the atmosphere | Synonyms: humidness |
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| humidness | (noun) wetness in the atmosphere | Synonyms: humidity |
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| hyaloid | (noun) the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina | Synonyms: hyaloid membrane |
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| hyaluronidase | (noun) an enzyme (trade name Hyazyme) that splits hyaluronic acid and so lowers its viscosity and increases the permeability of connective tissue and the absorption of fluids | Synonyms: Hyazyme, spreading factor |
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| hybrid | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, crossbreed |
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| (noun) a car which runs on two power sources, usually an internal combustion engine and an electronic motor | Synonyms: hybrid car |
| (noun) a composite of mixed origin | - |
| (noun) a word that is composed of parts from different languages (e.g., `monolingual' has a Greek prefix and a Latin root) | Synonyms: loan-blend, loanblend |
| hybridisation | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridization, hybridizing, interbreeding |
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| hybridization | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridisation, hybridizing, interbreeding |
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| hybridizing | (noun) (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids | Synonyms: cross, crossbreeding, crossing, hybridisation, hybridization, interbreeding |
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| hybridoma | (noun) a hybrid cell resulting from the fusion of a lymphocyte and a tumor cell; used to culture a specific monoclonal antibody | - |
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| hydatid | (noun) cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) | - |
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| hydatidosis | (noun) infestation with larval echinococci (tapeworms) | Synonyms: echinococcosis, hydatid disease |
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