| boogeyman | (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, bugaboo, bugbear |
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| bookman | (noun) a learned person; someone who by long study has gained mastery in one or more disciplines | Synonyms: scholar, scholarly person |
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| boomerang | (noun) a miscalculation that recoils on its maker | Synonyms: backfire |
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| (noun) a curved piece of wood; when properly thrown will return to thrower | Synonyms: throw stick, throwing stick |
| borderland | (noun) district consisting of the area on either side of a border or boundary of a country or an area | Synonyms: border district, march, marchland |
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| botanical | (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
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| botanist | (noun) a biologist specializing in the study of plants | Synonyms: phytologist, plant scientist |
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| botany | (noun) the branch of biology that studies plants | Synonyms: phytology |
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| (noun) all the plant life in a particular region or period | Synonyms: flora, vegetation |
| bottomland | (noun) low-lying alluvial land near a river | Synonyms: bottom |
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| bouffant | (noun) a woman's hairstyle in which the hair gives a puffy appearance | - |
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| bowman | (noun) a person who is expert in the use of a bow and arrow | Synonyms: archer |
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| brachyuran | (noun) typical crabs | - |
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| brahman | (noun) the highest of the four varnas: the priestly or sacerdotal category | Synonyms: brahmin |
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| (noun) a member of the highest of the four Hindu varnas | Synonyms: brahmin |
| (noun) a member of a social and cultural elite (especially a descendant of an old New England family) | Synonyms: brahmin |
| brainpan | (noun) the part of the skull that encloses the brain | Synonyms: braincase, cranium |
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| brakeman | (noun) a railroad employee responsible for a train's brakes | - |
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| bran | (noun) food prepared from the husks of cereal grains | - |
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| (noun) broken husks of the seeds of cereal grains that are separated from the flour by sifting | - |
| branch | (noun) any projection that is thought to resemble a human arm | Synonyms: arm, limb |
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| (noun) a division of some larger or more complex organization | Synonyms: arm, subdivision |
| (noun) a stream or river connected to a larger one | - |
| (noun) a natural consequence of development | Synonyms: offset, offshoot, outgrowth |
| (noun) a division of a stem, or secondary stem arising from the main stem of a plant | - |
| (noun) a part of a forked or branching shape | Synonyms: leg, ramification |
| branchia | (noun) respiratory organ of aquatic animals that breathe oxygen dissolved in water | Synonyms: gill |
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| branching | (noun) the act of branching out or dividing into branches | Synonyms: fork, forking, ramification |
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| branchiopod | (noun) aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding | Synonyms: branchiopod crustacean, branchiopodan |
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| branchiopodan | (noun) aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding | Synonyms: branchiopod, branchiopod crustacean |
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| branchlet | (noun) a small branch or division of a branch (especially a terminal division); usually applied to branches of the current or preceding year | Synonyms: sprig, twig |
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| brand | (noun) a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard | Synonyms: blade, steel, sword |
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| (noun) a recognizable kind | Synonyms: make |
| (noun) a name given to a product or service | Synonyms: brand name, marque, trade name |
| (noun) a symbol of disgrace or infamy | Synonyms: mark, stain, stigma |
| (noun) identification mark on skin, made by burning | - |
| (noun) a piece of wood that has been burned or is burning | Synonyms: firebrand |
| branding | (noun) the act of stigmatizing | Synonyms: stigmatisation, stigmatization |
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| brandish | (noun) the act of waving | Synonyms: flourish |
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| brandy | (noun) distilled from wine or fermented fruit juice | - |
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| brandyball | (noun) a British candy flavored with brandy | - |
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| brandysnap | (noun) a gingersnap flavored with brandy | - |
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| brant | (noun) small dark geese that breed in the north and migrate southward | Synonyms: brant goose, brent, brent goose |
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| brigand | (noun) an armed thief who is (usually) a member of a band | Synonyms: bandit |
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| brigandine | (noun) a medieval coat of chain mail consisting of metal rings sewn onto leather or cloth | - |
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| brigantine | (noun) two-masted sailing vessel square-rigged on the foremast and fore-and-aft rigged on the mainmast | Synonyms: hermaphrodite brig |
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| brilliance | (noun) a light within the field of vision that is brighter than the brightness to which the eyes are adapted | Synonyms: blaze, glare |
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| (noun) the quality of being magnificent or splendid or grand | Synonyms: grandeur, grandness, magnificence, splendor, splendour |
| (noun) unusual mental ability | Synonyms: genius |
| brilliancy | (noun) a quality that outshines the usual | Synonyms: luster, lustre, splendor, splendour |
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| brilliantine | (noun) a pomade to make the hair manageable and lustrous | - |
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| brinkmanship | (noun) the policy of pushing a dangerous situation to the brink of disaster (to the limits of safety) | - |
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| brisance | (noun) the shattering or crushing effect of a sudden release of energy as in an explosion | - |
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| brogan | (noun) a thick and heavy shoe | Synonyms: brogue, clodhopper, work shoe |
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| bromance | (noun) non-sexual but intense relationship between two men | - |
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| bryanthus | (noun) procumbent Old World mat-forming evergreen shrub with racemes of pinkish-white flowers | - |
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| bryozoan | (noun) sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding | Synonyms: moss animal, polyzoan, sea mat, sea moss |
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| buccaneer | (noun) someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation | Synonyms: pirate, sea robber, sea rover |
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| buccaneering | (noun) hijacking on the high seas or in similar contexts; taking a ship or plane away from the control of those who are legally entitled to it | Synonyms: piracy |
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| buckbean | (noun) perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface | Synonyms: bog myrtle, bogbean, marsh trefoil, Menyanthes trifoliata, water shamrock |
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| bugbane | (noun) a plant of the genus Cimicifuga having flowers in long racemes or panicles reported to be distasteful to insects | - |
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| (noun) North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally | Synonyms: American hellebore, Indian poke, Veratrum viride, white hellebore |
| buoyancy | (noun) the property of something weightless and insubstantial | Synonyms: airiness |
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| (noun) irrepressible liveliness and good spirit | Synonyms: irrepressibility |
| (noun) the tendency to float in water or other liquid | - |
| (noun) cheerfulness that bubbles to the surface | Synonyms: perkiness |
| bushman | (noun) a dweller in the Australian bush country | - |
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| businessman | (noun) a person engaged in commercial or industrial business (especially an owner or executive) | Synonyms: man of affairs |
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| businesswoman | (noun) a female businessperson | - |
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| busman | (noun) someone who drives a bus | Synonyms: bus driver |
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| butane | (noun) occurs in natural gas; used in the manufacture of rubber and fuels | - |
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| butanol | (noun) a flammable alcohol derived from butanes and used for solvents | Synonyms: butyl alcohol |
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| butanone | (noun) colorless soluble flammable liquid ketone used as a solvent for resins and as a paint remover and in lacquers and cements and adhesives and cleaning fluids and celluloid | Synonyms: methyl ethyl ketone |
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| butterbean | (noun) small flat green bean similar to lima beans | Synonyms: butter bean, civet bean, sieva bean |
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| bystander | (noun) a nonparticipant spectator | - |
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| byzant | (noun) a gold coin of the Byzantine Empire; widely circulated in Europe in the Middle Ages | Synonyms: bezant, bezzant, solidus |
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| cabana | (noun) a small tent used as a dressing room beside the sea or a swimming pool | - |
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| cabman | (noun) someone who drives a taxi for a living | Synonyms: cabby, cabdriver, hack-driver, hack driver, livery driver, taxidriver, taximan |
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| cabstand | (noun) a place where taxis park while awaiting customers | Synonyms: taxi rank, taxistand |
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| caecilian | (noun) any of the small slender limbless burrowing wormlike amphibians of the order Gymnophiona; inhabit moist soil in tropical regions | Synonyms: blindworm |
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| caesarean | (noun) the delivery of a fetus by surgical incision through the abdominal wall and uterus (from the belief that Julius Caesar was born that way) | Synonyms: abdominal delivery, C-section, caesarean delivery, caesarean section, caesarian, caesarian delivery, caesarian section, cesarean, cesarean delivery, cesarean section, cesarian, cesarian section |
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| caesarian | (noun) the delivery of a fetus by surgical incision through the abdominal wall and uterus (from the belief that Julius Caesar was born that way) | Synonyms: abdominal delivery, C-section, caesarean, caesarean delivery, caesarean section, caesarian delivery, caesarian section, cesarean, cesarean delivery, cesarean section, cesarian, cesarian section |
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| caftan | (noun) a (cotton or silk) cloak with full sleeves and sash reaching down to the ankles; worn by men in the Levant | Synonyms: kaftan |
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| (noun) a woman's dress style that imitates the caftan cloaks worn by men in the Near East | Synonyms: kaftan |
| caiman | (noun) a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly | Synonyms: cayman |
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| calanthe | (noun) any of various showy orchids of the genus Calanthe having white or yellow or rose-colored flowers and broad leaves folded lengthwise | - |
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| calcaneus | (noun) the largest tarsal bone; forms the human heel | Synonyms: heelbone, os tarsi fibulare |
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| calean | (noun) an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water | Synonyms: chicha, hookah, hubble-bubble, hubbly-bubbly, kalian, narghile, nargileh, sheesha, shisha, water pipe |
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| calliandra | (noun) any of various shrubs and small trees valued for their fine foliage and attractive spreading habit and clustered white to deep pink or red flowers | - |
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| cameraman | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cinematographer |
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| campana | (noun) the shape of a bell | Synonyms: bell, bell shape |
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| campanile | (noun) a bell tower; usually stands alone unattached to a building | Synonyms: belfry |
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| campanula | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: bellflower |
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| can | (noun) airtight sealed metal container for food or drink or paint etc. | Synonyms: tin, tin can |
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| (noun) a room or building equipped with one or more toilets | Synonyms: bathroom, john, lav, lavatory, privy, toilet |
| (noun) a plumbing fixture for defecation and urination | Synonyms: commode, crapper, pot, potty, stool, throne, toilet |
| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| (noun) a buoy with a round bottom and conical top | Synonyms: can buoy |
| (noun) the quantity contained in a can | Synonyms: canful |
| canafistola | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistula, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canafistula | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistola, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canal | (noun) long and narrow strip of water made for boats or for irrigation | - |
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| (noun) a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance | Synonyms: channel, duct, epithelial duct |
| (noun) (astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion | - |
| canaliculus | (noun) a small canal or duct as in some bones and parts of plants | - |
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| canalisation | (noun) the production of a canal or a conversion to canals | Synonyms: canalization |
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| (noun) management through specified channels of communication | Synonyms: canalization, channelisation, channelization |
| canalization | (noun) the production of a canal or a conversion to canals | Synonyms: canalisation |
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| (noun) management through specified channels of communication | Synonyms: canalisation, channelisation, channelization |
| canape | (noun) an appetizer consisting usually of a thin slice of bread or toast spread with caviar or cheese or other savory food | - |
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| canard | (noun) a deliberately misleading fabrication | - |
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| canary | (noun) any of several small Old World finches | Synonyms: canary bird |
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| (noun) a moderate yellow with a greenish tinge | Synonyms: canary yellow |
| (noun) a female singer | - |
| (noun) someone acting as an informer or decoy for the police | Synonyms: fink, sneak, sneaker, snitch, snitcher, stool pigeon, stoolie, stoolpigeon |
| canasta | (noun) a form of rummy using two decks of cards and four jokers; jokers and deuces are wild; the object is to form groups of the same rank | Synonyms: basket rummy, meld |
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| canavanine | (noun) an amino acid found in the jack bean | - |
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| cancan | (noun) a high-kicking dance of French origin performed by a female chorus line | - |
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| cancel | (noun) a notation cancelling a previous sharp or flat | Synonyms: natural |
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| cancellation | (noun) the act of cancelling; calling off some arrangement | - |
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| (noun) the speech act of revoking or annulling or making void | - |
| cancer | (noun) any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream | Synonyms: malignant neoplastic disease |
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| cancerweed | (noun) sage of eastern United States | Synonyms: cancer weed, Salvia lyrata |
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| cancroid | (noun) the most common form of skin cancer | Synonyms: squamous cell carcinoma |
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| candela | (noun) the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin | Synonyms: candle, cd, standard candle |
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| candelabra | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabrum |
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| candelabrum | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabra |
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| candelilla | (noun) wax-coated shrub of northern Mexico and southwestern United States | Synonyms: Euphorbia antisyphilitica |
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| (noun) wax-coated Mexican shrub related to Euphorbia antisyphilitica | Synonyms: Pedilanthus bracteatus, Pedilanthus pavonis |
| candida | (noun) any of the yeastlike imperfect fungi of the genus Candida | - |
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| candidacy | (noun) the campaign of a candidate to be elected | Synonyms: campaigning, candidature, electioneering, political campaign |
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| candidate | (noun) someone who is considered for something (for an office or prize or honor etc.) | Synonyms: prospect |
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| (noun) a politician who is running for public office | Synonyms: campaigner, nominee |
| candidature | (noun) the campaign of a candidate to be elected | Synonyms: campaigning, candidacy, electioneering, political campaign |
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| candidiasis | (noun) an infection caused by fungi of the genus Monilia or Candida (especially Candida albicans) | Synonyms: monilia disease, moniliasis |
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| candidness | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candor, candour, directness, forthrightness, frankness |
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| candle | (noun) stick of wax with a wick in the middle | Synonyms: taper, wax light |
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| (noun) the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin | Synonyms: candela, cd, standard candle |