| acetylcholine | (noun) a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems | - |
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| adrenaline | (noun) a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action | Synonyms: Adrenalin, epinephrin, epinephrine |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| airline | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline business, airway |
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| (noun) a hose that carries air under pressure | Synonyms: air hose |
| airliner | (noun) a commercial airplane that carries passengers | - |
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| alinement | (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alliance, coalition |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| aniline | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline oil, phenylamine |
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| anopheline | (noun) any mosquito of the genus Anopheles | - |
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| anticholinergic | (noun) a substance that opposes or blocks the action of acetylcholine | Synonyms: anticholinergic drug |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| balkline | (noun) line across a billiard table behind which the cue balls are placed at the start of a game | Synonyms: baulk-line, string line |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| beastliness | (noun) unpleasant nastiness; used especially of nasty weather | - |
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| (noun) the quality of being deliberately mean | Synonyms: meanness |
| beeline | (noun) the most direct route | - |
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| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| borderline | (noun) a line that indicates a boundary | Synonyms: border, boundary line, delimitation, mete |
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| bowline | (noun) a loop knot that neither slips nor jams | Synonyms: bowline knot |
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| breadline | (noun) a queue of people waiting for free food | Synonyms: bread line |
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| bristliness | (noun) the quality of being covered with prickly thorns or spines | Synonyms: prickliness, spininess, thorniness |
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| bubbliness | (noun) the property of giving off bubbles | Synonyms: effervescence, frothiness |
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| centerline | (noun) a line that bisects a plane figure | Synonyms: center line |
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| chilliness | (noun) the property of being moderately cold | Synonyms: coolness, nip |
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| (noun) a lack of affection or enthusiasm | Synonyms: coldness, coolness, frigidity, frigidness, iciness |
| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| choline | (noun) a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat | - |
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| cholinesterase | (noun) an enzyme that hydrolyses acetylcholine (into choline and acetic acid) | - |
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| citrulline | (noun) an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine | - |
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| cleanliness | (noun) diligence in keeping clean | - |
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| (noun) the habit of keeping free of superficial imperfections | - |
| clothesline | (noun) a cord on which clothes are hung to dry | - |
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| coastline | (noun) the outline of a coast | - |
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| comeliness | (noun) the quality of being good looking and attractive | Synonyms: beauteousness, fairness, loveliness |
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| compline | (noun) last of the seven canonical hours just before retiring | Synonyms: complin |
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| comradeliness | (noun) the quality of affording easy familiarity and sociability | Synonyms: camaraderie, chumminess, comradery, comradeship |
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| copaline | (noun) partly mineralized copal dug from the ground | Synonyms: copalite, fossil copal |
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| costliness | (noun) the quality possessed by something with a great price or value | Synonyms: dearness, preciousness |
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| courtliness | (noun) elegance suggestive of a royal court | - |
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| cowardliness | (noun) the trait of lacking courage | Synonyms: cowardice |
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| crinoline | (noun) a stiff coarse fabric used to stiffen hats or clothing | - |
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| (noun) a full stiff petticoat made of crinoline fabric | - |
| (noun) a skirt stiffened with hoops | Synonyms: hoopskirt |
| crumbliness | (noun) excessive breakableness | Synonyms: friability |
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| curliness | (noun) (of hair) a tendency to curl | Synonyms: waviness |
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| dastardliness | (noun) despicable cowardice | - |
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| dateline | (noun) a line at the beginning of a news article giving the date and place of origin of the news dispatch | - |
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| (noun) an imaginary line on the surface of the earth following (approximately) the 180th meridian | Synonyms: date line, International Date Line |
| deadline | (noun) the point in time at which something must be completed | - |
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| deadliness | (noun) the quality of being deadly | Synonyms: lethality |
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| decline | (noun) a downward slope or bend | Synonyms: declension, declination, declivity, descent, downslope, fall |
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| (noun) a gradual decrease; as of stored charge or current | Synonyms: decay |
| (noun) change toward something smaller or lower | Synonyms: diminution |
| (noun) a condition inferior to an earlier condition; a gradual falling off from a better state; decline | Synonyms: declination |
| delineation | (noun) representation by drawing or painting etc | Synonyms: depiction, portrayal |
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| (noun) a drawing of the outlines of forms or objects | Synonyms: depiction, limning, line drawing |
| (noun) a graphic or vivid verbal description | Synonyms: characterisation, characterization, depiction, picture, word-painting, word picture |
| discipline | (noun) training to improve strength or self-control | - |
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| (noun) the act of disciplining | Synonyms: correction |
| (noun) the trait of being well behaved | - |
| (noun) a branch of knowledge | Synonyms: bailiwick, field, field of study, study, subject, subject area, subject field |
| (noun) a system of rules of conduct or method of practice | - |
| disorderliness | (noun) untidiness (especially of clothing and appearance) | Synonyms: disarray |
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| (noun) a condition in which things are not in their expected places | Synonyms: disorder |
| (noun) rowdy behavior | Synonyms: roughness, rowdiness, rowdyism |
| doxycycline | (noun) an antibiotic derived from tetracycline that is effective against many infections | Synonyms: Vibramycin |
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| dropline | (noun) a headline with the top line flush left and succeeding lines indented to the right | Synonyms: drop line, stagger head, staggered head, stephead, stepped line |
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| earliness | (noun) quality of coming early or earlier in time | - |
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| eyeliner | (noun) makeup applied to emphasize the shape of the eyes | - |
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| fatherliness | (noun) the benignity and protectiveness of or befitting a father | Synonyms: paternal quality |
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| fedelline | (noun) extremely fine pasta thinner than vermicelli | - |
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| feline | (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: felid |
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| fineliner | (noun) A felt-tip pen with a thin tip that produces thin lines. | Synonyms: fineliner pen |
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| friendliness | (noun) a friendly disposition | - |
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| (noun) a feeling of liking for another person; enjoyment in their company | - |
| gasoline | (noun) a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines | Synonyms: gas, gasolene, petrol |
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| gentlemanliness | (noun) Gentlemanly behaviour, characteristics of or pertaining to being a gentleman. | - |
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| ghastliness | (noun) the quality of being ghastly | Synonyms: grimness, gruesomeness, luridness |
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| ghostliness | (noun) strangeness by virtue of being mysterious and inspiring fear | Synonyms: eeriness |
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| glyoxaline | (noun) an organic base C3H4N2; a histamine inhibitor | Synonyms: imidazole, iminazole |
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| godliness | (noun) piety by virtue of being a godly person | - |
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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 | - |
| hairline | (noun) the natural margin formed by hair on the head | - |
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| (noun) a very thin line | - |
| handline | (noun) a fishing line managed principally by hand | Synonyms: hand line |
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| (noun) (climbing) a line that can be hung onto with hands while climbing up or down a steep or slick section for limited protection. | - |
| hardliner | (noun) a conservative who is uncompromising | - |
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| headline | (noun) the heading or caption of a newspaper article | Synonyms: newspaper headline |
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| headliner | (noun) a performer who receives prominent billing | Synonyms: star |
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| headlinese | (noun) using the abbreviated style of headline writers | - |
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| hemline | (noun) the line formed by the lower edge of a skirt or coat | - |
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| hilliness | (noun) the quality of being hilly | - |
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| hipline | (noun) the line formed by the lower edge of hip-length garment | - |
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| (noun) the line formed by measuring the hip at its greatest part | - |
| holiness | (noun) the quality of being holy | Synonyms: sanctitude, sanctity |
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| homeliness | (noun) an appearance that is not attractive or beautiful | Synonyms: plainness |
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| (noun) having a drab or dowdy quality; lacking stylishness or elegance | Synonyms: dowdiness, drabness |
| 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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| hyaline | (noun) a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions | Synonyms: hyalin |
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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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| hypogammaglobulinemia | (noun) an abnormally low concentration of gamma globulin in the blood and increased risk of 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 |
| indiscipline | (noun) the trait of lacking discipline | Synonyms: undiscipline |
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| jetliner | (noun) a large jet plane that carries passengers | - |
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| jolliness | (noun) feeling jolly and jovial and full of good humor | Synonyms: jollity, joviality |
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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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| kindliness | (noun) friendliness evidence by a kindly and helpful disposition | Synonyms: helpfulness |
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| knightliness | (noun) the medieval principles governing knighthood and knightly conduct | Synonyms: chivalry |
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| landline | (noun) a telephone line that travels over terrestrial circuits | Synonyms: land line |
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| lazuline | (noun) a light shade of blue | Synonyms: azure, cerulean, sapphire, sky-blue |
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| leisureliness | (noun) slowness by virtue of being leisurely | - |
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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 |
| likeliness | (noun) the probability of a specified outcome | Synonyms: likelihood |
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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 |
| lineage | (noun) inherited properties shared with others of your bloodline | Synonyms: ancestry, derivation, filiation |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, bloodline, descent, line, line of descent, origin, parentage, pedigree, stemma, stock |
| (noun) a rate of payment for written material that is measured according to the number of lines submitted | Synonyms: linage |
| (noun) the number of lines in a piece of printed material | Synonyms: linage |
| (noun) the kinship relation between an individual and the individual's progenitors | Synonyms: descent, filiation, line of descent |
| lineament | (noun) the characteristic parts of a person's face: eyes and nose and mouth and chin | Synonyms: feature |
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| (noun) a characteristic property that defines the apparent individual nature of something | Synonyms: character, quality |
| linearity | (noun) the property of having one dimension | Synonyms: one-dimensionality |
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| lineation | (noun) the act of marking or outlining with lines | - |
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| (noun) the line that appears to bound an object | Synonyms: outline |
| linebacker | (noun) (American football) the position of a defensive football player who plays close behind the line of scrimmage | Synonyms: line backer |
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| (noun) a defensive football player who takes a position close behind the linemen | Synonyms: line backer |
| linecut | (noun) engraving consisting of a block that has been etched or engraved | Synonyms: line block, line engraving |
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| (noun) a print obtained from a line drawing | Synonyms: line engraving |