| lightener | (noun) any type of lightening agent that can be used to brighten the appearance of hair, skin, wood and other surfaces. | - |
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| lightening | (noun) changing to a lighter color | Synonyms: whitening |
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| (noun) descent of the uterus into the pelvic cavity that occurs late in pregnancy; the fetus is said to have dropped | - |
| lighter | (noun) a device for lighting or igniting fuel or charges or fires | Synonyms: igniter, ignitor, light |
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| (noun) a flatbottom boat for carrying heavy loads (especially on canals) | Synonyms: barge, flatboat, hoy |
| (noun) a substance used to ignite or kindle a fire | Synonyms: igniter, ignitor |
| (verb) transport in a flatbottom boat | - |
| lighterage | (noun) the transportation of goods on a lighter | - |
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| (noun) the fee charged for carrying goods in lighters | - |
| lighterman | (noun) someone who operates a barge | Synonyms: bargee, bargeman |
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| lightheaded | (adjective) lacking seriousness; given to frivolity | Synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, silly |
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| (adjective) weak and likely to lose consciousness | Synonyms: faint, light-headed, light, swooning |
| lightheadedness | (noun) a frivolous lack of prudence | - |
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| (noun) a reeling sensation; a feeling that you are about to fall | Synonyms: dizziness, giddiness, vertigo |
| lighthearted | (adjective) carefree and happy and lighthearted | Synonyms: blithe, blithesome, light-hearted, lightsome |
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| lightheartedness | (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, insouciance, lightsomeness |
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| lighthouse | (noun) a tower with a light that gives warning of shoals to passing ships | Synonyms: beacon, beacon light, pharos |
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| lighting | (noun) the act of setting something on fire | Synonyms: firing, ignition, inflammation, kindling |
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| (noun) the craft of providing artificial light | - |
| (noun) apparatus for supplying artificial light effects for the stage or a film | - |
| (noun) having abundant light or illumination | Synonyms: light |
| lightless | (adjective) without illumination | Synonyms: unilluminated, unlighted, unlit |
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| (adjective) giving no light | - |
| lightlessness | (noun) total absence of light | Synonyms: black, blackness, pitch blackness, total darkness |
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| lightly | (adverb) with little weight or force | Synonyms: gently, softly |
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| (adverb) indulging with temperance | - |
| (adverb) with few burdens | Synonyms: light |
| (adverb) in a small quantity or extent | Synonyms: thinly |
| (adverb) with indifference or without dejection | - |
| (adverb) to a slight degree | - |
| (adverb) without good reason | - |
| lightness | (noun) the trait of being lighthearted and frivolous | Synonyms: lightsomeness |
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| (noun) the visual effect of illumination on objects or scenes as created in pictures | Synonyms: light |
| (noun) the property of being comparatively small in weight | Synonyms: weightlessness |
| (noun) having a light color | - |
| (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, legerity, lightsomeness, nimbleness |
| (noun) a feeling of joy and pride | Synonyms: elation, high spirits |
| lightning | (noun) the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more | - |
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| (noun) abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light | - |
| lightproof | (adjective) not penetrable by light | Synonyms: light-tight |
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| lightship | (noun) a ship equipped like a lighthouse and anchored where a permanent lighthouse would be impracticable | - |
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| lightsome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, blithesome, light-hearted, lighthearted |
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| (adjective) moving easily and quickly; nimble | Synonyms: light, tripping |
| lightsomely | (adverb) in a light-hearted manner | Synonyms: light-heartedly |
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| (adverb) moving with quick light steps | Synonyms: trippingly |
| lightsomeness | (noun) the trait of being lighthearted and frivolous | Synonyms: lightness |
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| (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: agility, legerity, lightness, nimbleness |
| (noun) the cheerful feeling you have when nothing is troubling you | Synonyms: carefreeness, insouciance, lightheartedness |
| lightstick | (noun) A portable rod used for illumination. | - |
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| lightweight | (adjective) weighing relatively little compared with another item or object of similar use | - |
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| (adjective) having no importance or influence | - |
| (noun) A weight class division in combat sports, for fighters heavier than those in the featherweight division and lighter than those in the welterweight division. | - |
| (noun) a professional boxer who weighs between 131 and 135 pounds | - |
| (noun) a wrestler who weighs 139-154 pounds | - |
| (noun) someone who is unimportant but cheeky and presumptuous | Synonyms: jackanapes, whippersnapper |
| (noun) an amateur boxer who weighs no more than 132 pounds | - |
| lightwood | (noun) tall Australian acacia yielding highly valued black timber | Synonyms: Acacia melanoxylon |
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| ligne | (noun) a linear unit (1/40 inch) used to measure diameter of buttons | - |
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| ligneous | (adjective) consisting of or containing lignin or xylem | - |
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| lignify | (verb) convert into wood or cause to become woody | - |
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| lignin | (noun) a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants | - |
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| lignite | (noun) intermediate between peat and bituminous coal | Synonyms: brown coal, wood coal |
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| lignosae | (noun) a category in some early taxonomies | - |
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| lignum | (noun) woody tissue | - |
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| ligule | (noun) (botany) any appendage to a plant that is shaped like a strap | - |
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| limelight | (noun) a lamp consisting of a flame directed at a cylinder of lime with a lens to concentrate the light; formerly used for stage lighting | Synonyms: calcium light |
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| (noun) a focus of public attention | Synonyms: glare, public eye, spotlight |
| loligo | (noun) somewhat flattened cylindrical squid | - |
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| malign | (adjective) evil or harmful in nature or influence | - |
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| (adjective) having or exerting a malignant influence | Synonyms: evil, malefic, malevolent |
| (verb) speak unfavorably about | Synonyms: badmouth, drag through the mud, traduce |
| malignance | (noun) quality of being disposed to evil; intense ill will | Synonyms: malignancy, malignity |
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| (noun) (medicine) a malignant state; progressive and resistant to treatment and tending to cause death | Synonyms: malignancy |
| malignancy | (noun) quality of being disposed to evil; intense ill will | Synonyms: malignance, malignity |
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| (noun) (medicine) a malignant state; progressive and resistant to treatment and tending to cause death | Synonyms: malignance |
| malignant | (adjective) dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor) | - |
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| malignantly | (adverb) in a malignant manner, as of a tumor that spreads | - |
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| maligner | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, defamer, libeler, slanderer, traducer, vilifier |
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| malignity | (noun) quality of being disposed to evil; intense ill will | Synonyms: malignance, malignancy |
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| (noun) wishing evil to others | Synonyms: malevolence |
| malignly | (adverb) in a malign and evil manner | - |
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| malignment | (noun) slanderous defamation | Synonyms: smear, vilification |
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| milligram | (noun) one thousandth (1/1,000) gram | Synonyms: mg |
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| misalign | (verb) align imperfectly or badly | - |
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| misalignment | (noun) the spatial property of things that are not properly aligned | - |
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| moonlight | (noun) the light of the Moon | Synonyms: Moon, moonshine |
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| (verb) work a second job, usually after hours | - |
| moonlighter | (noun) a person who holds a second job (usually after hours) | - |
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| mulligan | (noun) Irish version of burgoo | Synonyms: Irish burgoo, mulligan stew |
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| mulligatawny | (noun) a soup of eastern India that is flavored with curry; prepared with a meat or chicken base | - |
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| neglige | (noun) a loose dressing gown for women | Synonyms: housecoat, negligee, peignoir, wrapper |
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| negligee | (noun) a loose dressing gown for women | Synonyms: housecoat, neglige, peignoir, wrapper |
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| negligence | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, nonperformance |
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| (noun) the trait of neglecting responsibilities and lacking concern | Synonyms: neglect, neglectfulness |
| negligent | (adjective) characterized by neglect and undue lack of concern | - |
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| negligently | (adverb) in a negligent manner | - |
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| negligible | (adjective) so small as to be meaningless; insignificant | - |
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| (adjective) not worth considering | Synonyms: paltry, trifling |
| nonaligned | (adjective) not affiliated with any faction, party, or cause | - |
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| nonalignment | (noun) people (or countries) who are not aligned with other people (or countries) in a pact or treaty | Synonyms: nonalinement |
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| nonbelligerent | (adjective) not directly at war | - |
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| nonobligatory | (adjective) not required by rule or law | Synonyms: nonmandatory |
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| obbligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obligato |
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| (noun) a persistent but subordinate motif | Synonyms: obligato |
| obligate | (adjective) restricted to a particular condition of life | - |
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| (verb) bind by an obligation; cause to be indebted | Synonyms: bind, hold, oblige |
| (verb) commit in order to fulfill an obligation | - |
| (verb) force somebody to do something | Synonyms: compel, oblige |
| obligated | (adjective) caused by law or conscience to follow a certain course | - |
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| obligation | (noun) the social force that binds you to the courses of action demanded by that force | Synonyms: duty, responsibility |
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| (noun) a legal agreement specifying a payment or action and the penalty for failure to comply | - |
| (noun) a written promise to repay a debt | Synonyms: certificate of indebtedness, debt instrument |
| (noun) a personal relation in which one is indebted for a service or favor | Synonyms: indebtedness |
| (noun) the state of being obligated to do or pay something | - |
| obligational | (adjective) relating or constituting or qualified to create a legal or financial obligation | - |
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| obligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obbligato |
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| (noun) a persistent but subordinate motif | Synonyms: obbligato |
| obligatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, mandatorily |
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| (adverb) in an obligatory manner | - |
| obligatory | (adjective) morally or legally constraining or binding | - |
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| (adjective) required by obligation or compulsion or convention | - |
| oblige | (verb) bind by an obligation; cause to be indebted | Synonyms: bind, hold, obligate |
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| (verb) provide a service or favor for someone | Synonyms: accommodate |
| (verb) force somebody to do something | Synonyms: compel, obligate |
| obliged | (adjective) under a moral obligation to do something | Synonyms: duty-bound |
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| obliger | (noun) someone who performs a service or does a favor | Synonyms: accommodator |
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| obliging | (adjective) showing a cheerful willingness to do favors for others | Synonyms: complaisant |
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| obligingly | (adverb) in accommodation | Synonyms: accommodatingly |
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| obligingness | (noun) a disposition or tendency to yield to the will of others | Synonyms: complaisance, compliance, compliancy, deference |
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| oligarch | (noun) one of the rulers in an oligarchy | - |
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| oligarchic | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchical |
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| oligarchical | (adjective) of or relating to or supporting or characteristic of an oligarchy | Synonyms: oligarchic |
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| oligarchy | (noun) a political system governed by a few people | - |
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| oligo | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligonucleotide |
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| oligochaete | (noun) hermaphroditic terrestrial and aquatic annelids having bristles borne singly along the length of the body | Synonyms: oligochaete worm |
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| oligoclase | (noun) any of a series of triclinic feldspars that form rocks | Synonyms: plagioclase |
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| oligodactyly | (noun) congenital condition in which some fingers or toes are missing | - |
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| oligodendria | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendroglia |
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| oligodendrocyte | (noun) a cell of the oligodendroglia | - |
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| oligodendroglia | (noun) tissue consisting of glial cells with sheetlike processes that form the myelin sheath of nerve fibers | Synonyms: oligodendria |
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| oligodontia | (noun) congenital condition in which some of the teeth are missing | - |
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| oligomenorrhea | (noun) abnormally light or infrequent menstruation | - |
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| oligonucleotide | (noun) (biochemistry) a polynucleotide whose molecules contain relatively few nucleotides | Synonyms: oligo |
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| oligopoly | (noun) (economics) a market in which control over the supply of a commodity is in the hands of a small number of producers and each one can influence prices and affect competitors | - |
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| oligosaccharide | (noun) any of the carbohydrates that yield only a few monosaccharide molecules on complete hydrolysis | - |
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| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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| oliguria | (noun) production of an abnormally small amount of urine | - |
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| (noun) abnormally small production of urine; can be a symptom of kidney disease or obstruction of the urinary tract or edema or an imbalance of fluids and electrolytes in the body | - |
| overflight | (noun) a flight by an aircraft over a particular area (especially over an area in foreign territory) | - |
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| penlight | (noun) a small flashlight resembling a fountain pen | - |
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| plight | (noun) a solemn pledge of fidelity | Synonyms: troth |
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| (noun) a situation from which extrication is difficult especially an unpleasant or trying one | Synonyms: predicament, quandary |
| (verb) promise solemnly and formally | Synonyms: pledge |
| (verb) give to in marriage | Synonyms: affiance, betroth, engage |
| profligacy | (noun) dissolute indulgence in sensual pleasure | Synonyms: dissipation, dissolution, licentiousness, looseness |
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| (noun) the trait of spending extravagantly | Synonyms: extravagance, prodigality |
| profligate | (adjective) unrestrained by convention or morality | Synonyms: debauched, degenerate, degraded, dissipated, dissolute, fast, libertine, riotous |
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| (adjective) recklessly wasteful | Synonyms: extravagant, prodigal, spendthrift |
| (noun) a dissolute man in fashionable society | Synonyms: blood, rake, rakehell, rip, roue |
| (noun) a recklessly extravagant consumer | Synonyms: prodigal, squanderer |
| profligately | (adverb) in a dissolute way | Synonyms: dissolutely |
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| pyroligneous | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyrolignic |
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| pyrolignic | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyroligneous |
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