| bourdon | (noun) a pipe of the bagpipe that is tuned to produce a single continuous tone | Synonyms: drone, drone pipe |
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| boustrophedon | (noun) an ancient writing system: having alternate lines written in opposite directions; literally `as the ox ploughs' | - |
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| boustrophedonic | (adjective) of or relating to writing alternate lines in opposite directions | - |
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| brachiopodous | (adjective) of or belonging to the phylum Brachiopoda | Synonyms: brachiopod |
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| braggadocio | (noun) vain and empty boasting | Synonyms: bluster, rhodomontade, rodomontade |
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| branchiopodous | (adjective) of or relating to or characteristic of the subclass Branchiopoda | Synonyms: branchiopod, branchiopodan |
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| bravado | (noun) a swaggering show of courage | Synonyms: bluster |
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| breakdown | (noun) the act of disrupting an established order so it fails to continue | Synonyms: dislocation |
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| (noun) an analysis into mutually exclusive categories | Synonyms: partitioning |
| (noun) a cessation of normal operation | Synonyms: equipment failure |
| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: decomposition, putrefaction, rot, rotting |
| (noun) (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance | Synonyms: chemical decomposition reaction, decomposition, decomposition reaction |
| (noun) a mental or physical breakdown | Synonyms: crack-up |
| bridoon | (noun) a bit resembling a snaffle bit; used with a separate curb | - |
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| bulldog | (noun) a sturdy thickset short-haired breed with a large head and strong undershot lower jaw; developed originally in England for bull baiting | Synonyms: English bulldog |
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| (verb) attack viciously and ferociously | - |
| (verb) throw a steer by seizing the horns and twisting the neck, as in a rodeo | - |
| bulldoze | (verb) flatten with or as if with a bulldozer | - |
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| bulldozer | (noun) large powerful tractor; a large blade in front flattens areas of ground | Synonyms: dozer |
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| burdock | (noun) any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs | Synonyms: clotbur |
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| calando | (adjective) (music) gradually decreasing in tempo and volume | - |
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| calcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: chalcedony |
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| candor | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candidness, candour, directness, forthrightness, frankness |
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| (noun) ability to make judgments free from discrimination or dishonesty | Synonyms: candour, fair-mindedness, fairness |
| candour | (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candidness, candor, directness, forthrightness, frankness |
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| (noun) ability to make judgments free from discrimination or dishonesty | Synonyms: candor, fair-mindedness, fairness |
| carbonado | (noun) a piece of meat (or fish) that has been scored and broiled | - |
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| (noun) an inferior dark diamond used in industry for drilling and polishing | Synonyms: black diamond |
| cardoon | (noun) only parts eaten are roots and especially stalks (blanched and used as celery); related to artichokes | - |
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| (noun) southern European plant having spiny leaves and purple flowers cultivated for its edible leafstalks and roots | Synonyms: Cynara cardunculus |
| chador | (noun) a cloth used as a head covering (and veil and shawl) by Muslim and Hindu women | Synonyms: chadar, chaddar, chuddar |
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| chaetodon | (noun) any fish of the genus Chaetodon | - |
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| chalcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: calcedony |
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| chlamydospore | (noun) thick-walled asexual resting spore of certain fungi and algae | - |
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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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| chordomesoderm | (noun) the area of mesoderm that forms the notochord | Synonyms: chordamesoderm |
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| chordophone | (noun) a stringed instrument of the group including harps, lutes, lyres, and zithers | - |
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| cladode | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladophyll, phylloclad, phylloclade |
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| cladogram | (noun) a tree diagram used to illustrate phylogenetic relationships | - |
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| cladophyll | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladode, phylloclad, phylloclade |
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| clampdown | (noun) sudden restriction on an activity | - |
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| closedown | (noun) termination of operations | Synonyms: closing, closure, shutdown |
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| coccidioidomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidiomycosis, desert rheumatism, valley fever |
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| codon | (noun) a specific sequence of three adjacent nucleotides on a strand of DNA or RNA that specifies the genetic code information for synthesizing a particular amino acid | - |
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| comedo | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: blackhead |
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| comedogen | (noun) A substance that tends to produce acne, such as by clogging pores on the skin. | Synonyms: comedogenic, comedogenic substance |
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| comedogenic | (noun) A substance that tends to produce acne, such as by clogging pores on the skin. | Synonyms: comedogen, comedogenic substance |
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| comedown | (noun) decline to a lower status or level | - |
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| commando | (noun) an amphibious military unit trained for raids into enemy territory | - |
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| (noun) a member of a military unit trained as shock troops for hit-and-run raids | Synonyms: ranger |
| commodore | (noun) a commissioned naval officer who ranks above a captain and below a rear admiral; the lowest grade of admiral | - |
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| condo | (noun) one of the dwelling units in a condominium | Synonyms: condominium |
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| condole | (verb) express one's sympathetic grief, on the occasion of someone's death | - |
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| condolence | (noun) an expression of sympathy with another's grief | Synonyms: commiseration |
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| condolent | (adjective) expressing sympathy with a person who experienced the death of a loved one | - |
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| condom | (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse | Synonyms: prophylactic, rubber, safe, safety |
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| condominium | (noun) housing consisting of a complex of dwelling units (as an apartment house) in which each unit is individually owned | - |
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| (noun) one of the dwelling units in a condominium | Synonyms: condo |
| condonation | (noun) a pardon by treating the offender as if the offense had not occurred | - |
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| condone | (verb) excuse, overlook, or make allowances for; be lenient with | Synonyms: excuse |
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| condor | (noun) the largest flying birds in the western hemisphere | - |
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| conodont | (noun) small (2 inches long) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes | - |
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| (noun) the tiny fossil cone-shaped tooth of a primitive vertebrate of order Conodonta | - |
| conquistador | (noun) an adventurer (especially one who led the Spanish conquest of Mexico and Peru in the 16th century) | - |
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| coondog | (noun) any dog trained to hunt raccoons | - |
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| cordoba | (noun) the basic unit of money in Nicaragua; equal to 100 centavos | - |
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| cordon | (noun) adornment consisting of an ornamental ribbon or cord | - |
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| (noun) cord or ribbon worn as an insignia of honor or rank | - |
| (noun) a series of sentinels or of military posts enclosing or guarding some place or thing | - |
| cordovan | (noun) a fine leather originally made in Cordoba, Spain | - |
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| corridor | (noun) an enclosed passageway; rooms usually open onto it | - |
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| corundom | (noun) very hard mineral used as an abrasive | Synonyms: corundum |
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| cotyledon | (noun) embryonic leaf in seed-bearing plants | Synonyms: seed leaf |
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| countdown | (noun) counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle) | - |
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| coydog | (noun) offspring of a coyote and a dog | - |
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| crackdown | (noun) severely repressive actions | - |
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| credo | (noun) any system of principles or beliefs | Synonyms: creed |
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| crescendo | (adjective) (music) gradually increasing in volume | - |
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| (noun) (music) a gradual increase in loudness | - |
| (verb) grow louder | - |
| cuckoldom | (noun) the state of a husband whose wife has committed adultery | - |
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| culdoscope | (noun) a specialized endoscope for visually examining a woman's pelvic organs | - |
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| culdoscopy | (noun) endoscopic examination of a woman's pelvic organs by the insertion of a culdoscope through the vagina | - |
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| cuspidor | (noun) a receptacle for spit (usually in a public place) | Synonyms: spittoon |
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| cynodont | (noun) small carnivorous reptiles | - |
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| cyprinodont | (noun) any member of the family Cyprinodontidae | - |
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| dado | (noun) panel forming the lower part of an interior wall when it is finished differently from the rest of the wall | Synonyms: wainscot |
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| (noun) a rectangular groove cut into a board so that another piece can fit into it | - |
| (noun) the section of a pedestal between the base and the surbase | - |
| (verb) cut a dado into or fit into a dado | - |
| (verb) provide with a dado | - |
| decrescendo | (adjective) (music) gradually decreasing in volume | Synonyms: diminuendo |
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| (noun) (music) a gradual decrease in loudness | Synonyms: diminuendo |
| (verb) grow quieter | - |
| deodorant | (noun) a toiletry applied to the skin in order to mask unpleasant odors | Synonyms: deodourant |
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| deodorise | (verb) eliminate the odor from | Synonyms: deodorize, deodourise |
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| deodorize | (verb) eliminate the odor from | Synonyms: deodorise, deodourise |
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| deodourant | (noun) a toiletry applied to the skin in order to mask unpleasant odors | Synonyms: deodorant |
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| deodourise | (verb) eliminate the odor from | Synonyms: deodorise, deodorize |
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| desperado | (noun) a bold outlaw (especially on the American frontier) | Synonyms: desperate criminal |
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| dicamptodon | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodontid |
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| dicamptodontid | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodon |
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| dicotyledon | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, exogen, magnoliopsid |
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| dicotyledonous | (adjective) (of a flowering plant) having two cotyledons in the seed | - |
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| dicynodont | (noun) a kind of therapsid | - |
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| dildo | (noun) a vibrating device that substitutes for an erect penis to provide vaginal stimulation | - |
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| dimetrodon | (noun) carnivorous dinosaur of the Permian in North America having a crest or dorsal sail | - |
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| diminuendo | (adjective) (music) gradually decreasing in volume | Synonyms: decrescendo |
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| (noun) (music) a gradual decrease in loudness | Synonyms: decrescendo |
| dingdong | (adverb) heartily or earnestly | - |
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| (verb) go `ding dong', like a bell | Synonyms: ding, dong |
| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| do | (noun) an uproarious party | Synonyms: bash, brawl |
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| (noun) the syllable naming the first (tonic) note of any major scale in solmization | Synonyms: doh, ut |
| (verb) arrange attractively | Synonyms: arrange, coif, coiffe, coiffure, dress, set |
| (verb) behave in a certain manner; show a certain behavior; conduct or comport oneself | Synonyms: acquit, act, bear, behave, carry, comport, conduct, deport |
| (verb) create or design, often in a certain way | Synonyms: make |
| (verb) carry out or perform an action | Synonyms: execute, perform |
| (verb) give rise to; cause to happen or occur, not always intentionally | Synonyms: cause, make |
| (verb) travel or traverse (a distance) | - |
| (verb) engage in | Synonyms: make |
| (verb) carry out or practice; as of jobs and professions | Synonyms: exercise, practice, practise |
| (verb) carry on or function | Synonyms: manage |
| (verb) get (something) done | Synonyms: perform |
| (verb) proceed or get along | Synonyms: come, fare, get along, make out |
| (verb) be sufficient; be adequate, either in quality or quantity | Synonyms: answer, serve, suffice |
| (verb) spend time in prison or in a labor camp | Synonyms: serve |
| doable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, achievable, manageable, realizable |
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| dobbin | (noun) a quiet plodding workhorse | Synonyms: farm horse |
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| dobra | (noun) the basic unit of money on Sao Tome e Principe | - |
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| dobson | (noun) large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait | Synonyms: Corydalus cornutus, dobson fly, dobsonfly |
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| (noun) large brown aquatic larva of the dobsonfly; used as fishing bait | Synonyms: hellgrammiate |
| dobsonfly | (noun) large soft-bodied insect having long slender mandibles in the male; aquatic larvae often used as bait | Synonyms: Corydalus cornutus, dobson, dobson fly |
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| doc | (noun) a licensed medical practitioner | Synonyms: doctor, Dr., MD, medico, physician |
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| docent | (noun) a teacher at some universities | - |
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| docile | (adjective) willing to be taught or led or supervised or directed | - |
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| (adjective) easily handled or managed | Synonyms: gentle |
| (adjective) ready and willing to be taught | Synonyms: teachable |
| docility | (noun) the trait of being agreeably submissive and manageable | - |
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| dock | (noun) the solid bony part of the tail of an animal as distinguished from the hair | - |
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| (noun) a short or shortened tail of certain animals | Synonyms: bob, bobtail |
| (noun) landing in a harbor next to a pier where ships are loaded and unloaded or repaired; may have gates to let water in or out | Synonyms: dockage, docking facility |
| (noun) a platform built out from the shore into the water and supported by piles; provides access to ships and boats | Synonyms: pier, wharf, wharfage |
| (noun) an enclosure in a court of law where the defendant sits during the trial | - |
| (noun) a platform where trucks or trains can be loaded or unloaded | Synonyms: loading dock |
| (noun) any of certain coarse weedy plants with long taproots, sometimes used as table greens or in folk medicine | Synonyms: sorrel, sour grass |
| (verb) maneuver into a dock | - |
| (verb) remove or shorten the tail of an animal | Synonyms: bob, tail |
| (verb) come into dock | - |
| (verb) deduct from someone's wages | - |
| (verb) deprive someone of benefits, as a penalty | - |
| dockage | (noun) the act of securing an arriving vessel with ropes | Synonyms: docking, moorage, tying up |
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| (noun) landing in a harbor next to a pier where ships are loaded and unloaded or repaired; may have gates to let water in or out | Synonyms: dock, docking facility |
| (noun) a fee charged for a vessel to use a dock | Synonyms: docking fee |
| docker | (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, dockhand, dockworker, loader, longshoreman, lumper, stevedore |
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| docket | (noun) a temporally organized plan for matters to be attended to | Synonyms: agenda, schedule |
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| (noun) (law) the calendar of a court; the list of cases to be tried or a summary of the court's activities | - |
| (verb) make a summary or abstract of a legal document and inscribe it in a list | - |
| (verb) place on the docket for legal action | - |