| hornstone | (noun) a fine-grained metamorphic rock formed by the action of heat on clay rocks | Synonyms: hornfels |
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| hotline | (noun) a telefone line that provides direct and prompt information or advice to the caller in relation to a specific subject | Synonyms: hot line |
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| hurricane | (noun) a severe tropical cyclone usually with heavy rains and winds moving at 63-136 knots (12 on the Beaufort scale) | - |
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| hyaline | (noun) a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions | Synonyms: hyalin |
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| hydralazine | (noun) an antihypertensive drug (trade name Apresoline) that dilates blood vessels; used (often with a diuretic) to treat hypertension and congestive heart failure | Synonyms: Apresoline |
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| hydrazine | (noun) a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels | - |
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| hydrocortisone | (noun) an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism | Synonyms: Cortef, cortisol, Hydrocortone |
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| hydromorphone | (noun) a narcotic analgesic (trade name Dilaudid) used to treat moderate to severe pain | Synonyms: Dilaudid, hydromorphone hydrochloride |
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| hydroplane | (noun) an airplane that can land on or take off from water | Synonyms: seaplane |
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| (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydrofoil |
| hydroxybenzene | (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, oxybenzene, phenol, phenylic acid |
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| hydroxychloroquine | (noun) anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus | Synonyms: Plaquenil |
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| hydroxyproline | (noun) a crystalline amino acid obtained from gelatin or collagen | - |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| hydroxyzine | (noun) a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness | Synonyms: Atarax, hydroxyzine hydrochloride, Vistaril |
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| hygiene | (noun) the science concerned with the prevention of illness and maintenance of health | Synonyms: hygienics |
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| (noun) a condition promoting sanitary practices | - |
| hyoscine | (noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures | Synonyms: scopolamine |
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| hyoscyamine | (noun) a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract | - |
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| imipramine | (noun) a tricyclic antidepressant (trade names Imavate and Tofranil) used to treat clinical depression | Synonyms: Imavate, impramine hydrochloride, Tofranil |
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| immune | (noun) a person who is immune to a particular infection | - |
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| incline | (noun) an inclined surface connecting two levels | Synonyms: ramp |
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| (noun) an elevated geological formation | Synonyms: side, slope |
| indene | (noun) a colorless liquid hydrocarbon extracted from petroleum or coal tar and used in making synthetic resins | - |
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| indigene | (noun) an indigenous person who was born in a particular place | Synonyms: aboriginal, aborigine, indigen, native |
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| indiscipline | (noun) the trait of lacking discipline | Synonyms: undiscipline |
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| inosine | (noun) a nucleoside that is formed by the deamination of adenosine; used in kidney transplantation to provide a temporary source of sugar | - |
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| interne | (noun) an advanced student or graduate in medicine gaining supervised practical experience | Synonyms: houseman, intern, medical intern |
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| interphone | (noun) a telephonic intercommunication system linking different rooms in a building or ship etc | - |
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| intestine | (noun) the part of the alimentary canal between the stomach and the anus | Synonyms: bowel, gut |
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| iodine | (noun) a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic | Synonyms: tincture of iodine |
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| (noun) a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) | Synonyms: atomic number 53, I, iodin |
| iodothyronine | (noun) thyronine with iodine added | - |
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| iodotyrosine | (noun) tyrosine with iodine added | - |
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| iridosmine | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: osmiridium |
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| isanemone | (noun) an isogram connecting points having equal wind speed. | - |
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| isobutylene | (noun) used also in making gasoline components | - |
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| isochrone | (noun) an isogram connecting points at which something occurs or arrives at the same time | - |
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| isoflurane | (noun) a widely used inhalation anesthetic | - |
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| isogone | (noun) an imaginary line connecting points on the Earth's surface where the magnetic declination is the same | Synonyms: isogonal line, isogonic line |
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| isoleucine | (noun) an essential amino acid found in proteins; isomeric with leucine | - |
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| isophene | (noun) a line indicating biological events occurring with coincidence such as plants flowering. | - |
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| isophone | (noun) linguistics, an isogloss marking off an area in which a particular feature of pronunciation is found. | - |
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| jadestone | (noun) a semiprecious gemstone that takes a high polish; is usually green but sometimes whitish; consists of jadeite or nephrite | Synonyms: jade |
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| jasmine | (noun) any of several shrubs and vines of the genus Jasminum chiefly native to Asia | - |
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| jawbone | (noun) the jaw in vertebrates that is hinged to open the mouth | Synonyms: jowl, lower jaw, lower jawbone, mandible, mandibula, mandibular bone, submaxilla |
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| jessamine | (noun) a climbing deciduous shrub with fragrant white or yellow or red flowers used in perfume and to flavor tea | Synonyms: common jasmine, Jasminum officinale, true jasmine |
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| julienne | (noun) a vegetable cut into thin strips | Synonyms: julienne vegetable |
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| (noun) a clear soup garnished with julienne vegetables | - |
| 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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| kerbstone | (noun) a paving stone forming part of a curb | Synonyms: curbstone |
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| kerosene | (noun) a flammable hydrocarbon oil used as fuel in lamps and heaters | Synonyms: coal oil, kerosine, lamp oil |
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| kerosine | (noun) a flammable hydrocarbon oil used as fuel in lamps and heaters | Synonyms: coal oil, kerosene, lamp oil |
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| ketamine | (noun) a general anesthetic and tranquilizer (not a barbiturate) that is administered intravenously or intramuscularly; used mainly by veterinarians or for minor surgery with geriatric or pediatric patients; taken in large doses it causes hallucinations similar to those associated with the use of PCP | Synonyms: Ketalar, ketamine hydrochloride |
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| ketone | (noun) any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals | - |
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| keystone | (noun) the central building block at the top of an arch or vault | Synonyms: headstone, key |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, linchpin, lynchpin, mainstay |
| kine | (noun) domesticated bovine animals as a group regardless of sex or age | Synonyms: Bos taurus, cattle, cows, oxen |
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| koine | (noun) a common language used by speakers of different languages | Synonyms: interlanguage, lingua franca |
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| krone | (noun) the basic unit of money in Denmark | Synonyms: Danish krone |
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| (noun) the basic unit of money in Norway | Synonyms: Norwegian krone |
| lactone | (noun) a cyclic intramolecular ester derived from a hydroxy acid. | - |
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| lagerphone | (noun) an Australian percussion instrument used for playing bush music; a long stick with bottle caps nailed loosely to it; played by hitting it with a stick or banging it on the ground | - |
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| lagune | (noun) a body of water cut off from a larger body by a reef of sand or coral | Synonyms: lagoon, laguna |
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| lamivudine | (noun) a nucleoside reverse transcriptase inhibitor that is very effective in combination with zidovudine in treating AIDS and HIV | Synonyms: 3TC |
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| landline | (noun) a telephone line that travels over terrestrial circuits | Synonyms: land line |
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| lane | (noun) a narrow way or road | - |
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| (noun) a well-defined track or path; for e.g. swimmers or lines of traffic | - |
| langoustine | (noun) caught in European waters; slenderer than American lobster | Synonyms: Norwegian lobster, scampo |
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| langsyne | (noun) past times remembered with nostalgia | Synonyms: auld langsyne, good old days, lang syne, old times |
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| lasagne | (noun) very wide flat strips of pasta | Synonyms: lasagna |
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| (noun) baked dish of layers of lasagna pasta with sauce and cheese and meat or vegetables | Synonyms: lasagna |
| latrine | (noun) a public toilet in a military area | - |
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| lazuline | (noun) a light shade of blue | Synonyms: azure, cerulean, sapphire, sky-blue |
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| leone | (noun) the basic unit of money in Sierra Leone; equal to 100 cents | - |
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| leopardbane | (noun) any of several herbs of the genus Doronicum having alternate often clasping stem leaves cultivated for their long stalks of yellow flower heads | Synonyms: leopard's-bane |
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| lepidomelane | (noun) a mica that is a biotite containing iron | - |
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| leptotene | (noun) the first stage of the prophase of meiosis | - |
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| leucine | (noun) a white crystalline amino acid occurring in proteins that is essential for nutrition; obtained by the hydrolysis of most dietary proteins | - |
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| libertine | (noun) a dissolute person; usually a man who is morally unrestrained | Synonyms: debauchee, rounder |
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| lifeline | (noun) line thrown from a vessel that people can cling to in order to save themselves from drowning | - |
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| (noun) line that raises or lowers a deep-sea diver | - |
| (noun) support that enables people to survive or to continue doing something (often by providing an essential connection) | - |
| (noun) a crease on the palm; its length is said by palmists to indicate how long you will live | Synonyms: life line, line of life |
| ligne | (noun) a linear unit (1/40 inch) used to measure diameter of buttons | - |
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| limestone | (noun) a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals | - |
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| limonene | (noun) a liquid terpene with a lemon odor; found in lemons and oranges and other essential oils | - |
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| limousine | (noun) large luxurious car; usually driven by a chauffeur | Synonyms: limo |
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| lindane | (noun) a white crystalline powder used as an agricultural insecticide | - |
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| line | (noun) the principal activity in your life that you do to earn money | Synonyms: business, job, line of work, occupation |
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| (noun) acting in conformity | - |
| (noun) something (as a cord or rope) that is long and thin and flexible | - |
| (noun) a conductor for transmitting electrical or optical signals or electric power | Synonyms: cable, transmission line |
| (noun) the road consisting of railroad track and roadbed | Synonyms: rail line, railway line |
| (noun) a commercial organization serving as a common carrier | - |
| (noun) a pipe used to transport liquids or gases | Synonyms: pipeline |
| (noun) a telephone connection | Synonyms: phone line, subscriber line, telephone circuit, telephone line |
| (noun) a particular kind of product or merchandise | Synonyms: business line, line of business, line of merchandise, line of products, product line |
| (noun) mechanical system in a factory whereby an article is conveyed through sites at which successive operations are performed on it | Synonyms: assembly line, production line |
| (noun) a conceptual separation or distinction | Synonyms: contrast, demarcation, dividing line |
| (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argument, argumentation, line of reasoning, logical argument |
| (noun) a mark that is long relative to its width | - |
| (noun) text consisting of a row of words written across a page or computer screen | - |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, melodic line, melodic phrase, melody, strain, tune |
| (noun) a short personal letter | Synonyms: billet, note, short letter |
| (noun) (often plural) a means of communication or access | Synonyms: channel, communication channel |
| (noun) persuasive but insincere talk that is usually intended to deceive or impress | - |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| (noun) a formation of people or things one behind another | - |
| (noun) a connected series of events or actions or developments | Synonyms: course |
| (noun) a formation of people or things one beside another | - |
| (noun) a spatial location defined by a real or imaginary unidimensional extent | - |
| (noun) in games or sports; a mark indicating positions or bounds of the playing area | - |
| (noun) a fortified position (especially one marking the most forward position of troops) | - |
| (noun) a single frequency (or very narrow band) of radiation in a spectrum | - |
| (noun) the maximum credit that a customer is allowed | Synonyms: bank line, credit line, line of credit, personal credit line, personal line of credit |
| (noun) space for one line of print (one column wide and 1/14 inch deep) used to measure advertising | Synonyms: agate line |
| (noun) a length (straight or curved) without breadth or thickness; the trace of a moving point | - |
| (noun) a slight depression or fold in the smoothness of a surface | Synonyms: crease, crinkle, furrow, seam, wrinkle |
| linguine | (noun) pasta in long slender flat strips | Synonyms: linguini |
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| liothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: T, triiodothyronine |
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| loadstone | (noun) a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically | Synonyms: lodestone |
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| lodestone | (noun) a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically | Synonyms: loadstone |
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| lomustine | (noun) an antineoplastic drug often used to treat brain tumors or Hodgkin's disease | - |
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| loxapine | (noun) a tranquilizer (trade name Loxitane) used to treat schizophrenia | Synonyms: Loxitane |
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| lucerne | (noun) important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop | Synonyms: alfalfa, Medicago sativa |
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| lupine | (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupin |
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| lycopene | (noun) carotenoid that makes tomatoes red; may lower the risk of prostate cancer | - |
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| lymphokine | (noun) a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages) | - |
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| lysine | (noun) an essential amino acid found in proteins; occurs especially in gelatin and casein | - |
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| macedoine | (noun) mixed diced fruits or vegetables; hot or cold | - |
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| machine | (noun) any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks | - |
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| (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, automobile, car, motorcar |
| (noun) a device for overcoming resistance at one point by applying force at some other point | Synonyms: simple machine |
| (noun) a group that controls the activities of a political party | Synonyms: political machine |
| (noun) an intricate organization that accomplishes its goals efficiently | - |
| (noun) an efficient person | - |
| madrilene | (noun) a tomato-flavored consomme; often served chilled | - |
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| magazine | (noun) a storehouse (as a compartment on a warship) where weapons and ammunition are stored | Synonyms: powder magazine, powder store |
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| (noun) product consisting of a paperback periodic publication as a physical object | - |
| (noun) a metal frame or container holding cartridges; can be inserted into an automatic gun | Synonyms: cartridge clip, cartridge holder, clip |
| (noun) a light-tight supply chamber holding the film and supplying it for exposure as required | Synonyms: cartridge |
| (noun) a periodic publication containing pictures and stories and articles of interest to those who purchase it or subscribe to it | Synonyms: mag |
| (noun) a business firm that publishes magazines | Synonyms: magazine publisher |
| mane | (noun) long coarse hair growing from the crest of the animal's neck | - |
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| (noun) growth of hair covering the scalp of a human being | Synonyms: head of hair |
| marchpane | (noun) almond paste and egg whites | Synonyms: marzipan |
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| margarine | (noun) a spread made chiefly from vegetable oils and used as a substitute for butter | Synonyms: margarin, marge, oleo, oleomargarine |
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| marine | (noun) a soldier who serves both on shipboard and on land | - |
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| marline | (noun) a small usually tarred line of 2 strands | - |
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| marlstone | (noun) metamorphic rock with approximately the same composition as marl | Synonyms: marlite |
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| marrowbone | (noun) a bone containing edible marrow; used especially in flavoring soup | - |
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