| alundum | (noun) a substance made of fused alumina | - |
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| apolune | (noun) apoapsis in orbit around the moon | Synonyms: aposelene |
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| aqualung | (noun) a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus | Synonyms: Aqua-Lung, scuba |
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| blunder | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| blunderbuss | (noun) a short musket of wide bore with a flared muzzle | - |
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| blunderer | (noun) someone who makes mistakes because of incompetence | Synonyms: botcher, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| bluntness | (noun) without sharpness or clearness of edge or point | Synonyms: dullness |
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| (noun) the quality of being direct and outspoken | - |
| clunch | (noun) stiff clay | - |
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| clunk | (noun) a heavy dull sound (as made by impact of heavy objects) | Synonyms: clump, thud, thump, thumping |
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| clunking | (noun) the sound of a horse's hoofs hitting on a hard surface | Synonyms: clip-clop, clippety-clop, clop, clopping, clumping |
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| diflunisal | (noun) nonsteroidal anti-inflammatory (trade name Dolobid) used to treat arthritis and other inflammatory conditions | Synonyms: Dolobid |
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| flunitrazepam | (noun) a depressant and tranquilizer (trade name Rohypnol) often used in the commission of sexual assault; legally available in Europe and Mexico and Colombia | Synonyms: Rohypnol |
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| flunk | (noun) failure to reach a minimum required performance | Synonyms: failing |
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| flunkey | (noun) a person of unquestioning obedience | Synonyms: flunky, stooge, yes-man |
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| (noun) a male servant (especially a footman) | Synonyms: flunky, lackey |
| flunky | (noun) a person of unquestioning obedience | Synonyms: flunkey, stooge, yes-man |
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| (noun) a male servant (especially a footman) | Synonyms: flunkey, lackey |
| involuntariness | (noun) the trait of being unwilling | Synonyms: unwillingness |
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| leflunomide | (noun) an anti-TNF compound (trade name Arava) that is given orally; can slow the progression of rheumatoid arthritis by slowing the proliferation of white blood cells which reduces inflammation in the synovium | Synonyms: Arava |
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| lunacy | (noun) foolish or senseless behavior | Synonyms: craziness, folly, foolery, indulgence, tomfoolery |
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| (noun) obsolete terms for legal insanity | Synonyms: insaneness, madness |
| lunatic | (noun) an insane person | Synonyms: maniac |
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| (noun) a reckless impetuous irresponsible person | Synonyms: daredevil, harum-scarum, hothead, madcap, swashbuckler |
| lunation | (noun) the period between successive new moons (29.531 days) | Synonyms: lunar month, moon, synodic month |
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| lunch | (noun) a midday meal | Synonyms: dejeuner, luncheon, tiffin |
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| luncheon | (noun) a midday meal | Synonyms: dejeuner, lunch, tiffin |
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| luncher | (noun) someone who is eating lunch | - |
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| lunching | (noun) the act of eating lunch | - |
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| lunchroom | (noun) a restaurant (in a facility) where lunch can be purchased | - |
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| lunchtime | (noun) the customary or habitual hour for eating lunch | Synonyms: lunch period |
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| lunette | (noun) oval or circular opening; to allow light into a dome or vault | Synonyms: fenestella |
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| (noun) temporary fortification like a detached bastion | - |
| lung | (noun) either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood | - |
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| lunge | (noun) the act of moving forward suddenly | Synonyms: lurch |
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| (noun) (fencing) an attacking thrust made with one foot forward and the back leg straight and with the sword arm outstretched forward | Synonyms: passado, straight thrust |
| lungen | (noun) tree of southeastern Asia to Australia grown primarily for its sweet edible fruit resembling litchi nuts; sometimes placed in genera Euphorbia or Nephelium | Synonyms: Dimocarpus longan, Euphorbia litchi, longan, longanberry, Nephelium longana |
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| lunger | (noun) someone who moves forward suddenly (as in fencing) | - |
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| (noun) a person with pulmonary tuberculosis | Synonyms: consumptive, tubercular |
| lungfish | (noun) air-breathing fish having an elongated body and fleshy paired fins; certain species construct mucus-lined mud coverings in which to survive drought | - |
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| lungi | (noun) a long piece of brightly colored cloth (cotton or silk) used as clothing (a skirt or loincloth or sash etc.) in India and Pakistan and Burma | Synonyms: longyi, lungyi |
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| lungyi | (noun) a long piece of brightly colored cloth (cotton or silk) used as clothing (a skirt or loincloth or sash etc.) in India and Pakistan and Burma | Synonyms: longyi, lungi |
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| lunkhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, muttonhead, numskull, shithead |
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| lunula | (noun) a crescent-shaped metal ornament of the Bronze Age | - |
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| (noun) the crescent-shaped area at the base of the human fingernail | Synonyms: half-moon, lunule |
| lunule | (noun) the crescent-shaped area at the base of the human fingernail | Synonyms: half-moon, lunula |
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| muskellunge | (noun) large (60 to 80 pounds) sport fish of North America | Synonyms: Esox masquinongy |
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| (noun) flesh of very large North American pike; a game fish | - |
| perilune | (noun) periapsis in orbit around the moon | Synonyms: periselene |
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| plunder | (noun) goods or money obtained illegally | Synonyms: booty, dirty money, loot, pillage, prize, swag |
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| plunderage | (noun) the act of plundering (especially the embezzlement of goods on shipboard) | - |
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| plunderer | (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, looter, pillager, raider, spoiler |
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| plundering | (noun) the act of stealing valuable things from a place | Synonyms: pillage, pillaging |
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| plunge | (noun) a brief swim in water | Synonyms: dip |
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| (noun) a steep and rapid fall | - |
| plunger | (noun) mechanical device that has a plunging or thrusting motion | Synonyms: piston |
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| (noun) hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains | Synonyms: plumber's helper |
| (noun) someone who risks losses for the possibility of considerable gains | Synonyms: speculator |
| (noun) someone who dives (into water) | Synonyms: diver |
| plunk | (noun) (baseball) hitting a baseball so that it drops suddenly | Synonyms: plunker |
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| (noun) a hollow twanging sound | - |
| plunker | (noun) (baseball) hitting a baseball so that it drops suddenly | Synonyms: plunk |
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| quellung | (noun) the swelling of the capsule surrounding a microorganism after reaction with an antibody; the basis of certain tests for identifying microorganisms | Synonyms: quellung reaction |
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| spelunker | (noun) a person who explores caves | Synonyms: potholer, spelaeologist, speleologist |
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| voluntary | (noun) composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance | - |
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| (noun) (military) a person who freely enlists for service | Synonyms: military volunteer, volunteer |
| volunteer | (noun) a person who performs voluntary work | Synonyms: unpaid worker |
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| (noun) (military) a person who freely enlists for service | Synonyms: military volunteer, voluntary |