| bourne | (noun) an archaic term for a goal or destination | Synonyms: bourn |
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| (noun) an archaic term for a boundary | Synonyms: bourn |
| bourtree | (noun) a common shrub with black fruit or a small tree of Europe and Asia; fruit used for wines and jellies | Synonyms: black elder, common elder, elderberry, European elder, Sambucus nigra |
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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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| bout | (noun) an occasion for excessive eating or drinking | Synonyms: binge, bust, tear |
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| (noun) a contest or fight (especially between boxers or wrestlers) | - |
| (noun) (sports) a division of a game during which one team is on the offensive | Synonyms: round, turn |
| (noun) a period of illness | - |
| boutique | (noun) a shop that sells women's clothes and jewelry | Synonyms: dress shop |
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| boutonniere | (noun) a flower that is worn in a buttonhole | - |
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| bovid | (noun) hollow-horned ruminants | - |
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| bovine | (noun) any of various members of the genus Bos | - |
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| bow | (noun) a stroke with a curved piece of wood with taut horsehair strands that is used in playing stringed instruments | - |
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| (noun) a slightly curved piece of resilient wood with taut horsehair strands; used in playing certain stringed instruments | - |
| (noun) a weapon for shooting arrows, composed of a curved piece of resilient wood with a taut cord to propel the arrow | - |
| (noun) a knot with two loops and loose ends; used to tie shoelaces | Synonyms: bowknot |
| (noun) a decorative interlacing of ribbons | - |
| (noun) something curved in shape | Synonyms: arc |
| (noun) front part of a vessel or aircraft | Synonyms: fore, prow, stem |
| (noun) an appearance by actors or performers at the end of the concert or play in order to acknowledge the applause of the audience | Synonyms: curtain call |
| (noun) bending the head or body or knee as a sign of reverence or submission or shame or greeting | Synonyms: bowing, obeisance |
| bowdlerisation | (noun) the act of deleting or modifying all passages considered to be indecent | Synonyms: bowdlerization |
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| (noun) written material that has been bowdlerized | Synonyms: bowdlerization |
| bowdleriser | (noun) a person who edits a text by removing obscene or offensive words or passages | Synonyms: bowdlerizer, expurgator |
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| bowdlerization | (noun) the act of deleting or modifying all passages considered to be indecent | Synonyms: bowdlerisation |
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| (noun) written material that has been bowdlerized | Synonyms: bowdlerisation |
| bowdlerizer | (noun) a person who edits a text by removing obscene or offensive words or passages | Synonyms: bowdleriser, expurgator |
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| bowel | (noun) the part of the alimentary canal between the stomach and the anus | Synonyms: gut, intestine |
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| bowels | (noun) the center of the Earth | - |
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| bower | (noun) a framework that supports climbing plants | Synonyms: arbor, arbour, pergola |
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| bowerbird | (noun) any of various birds of the Australian region whose males build ornamented structures resembling bowers in order to attract females | Synonyms: catbird |
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| bowfin | (noun) primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America | Synonyms: Amia calva, dogfish, grindle |
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| bowhead | (noun) large-mouthed Arctic whale | Synonyms: Balaena mysticetus, bowhead whale, Greenland whale |
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| bowing | (noun) managing the bow in playing a stringed instrument | - |
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| (noun) bending the head or body or knee as a sign of reverence or submission or shame or greeting | Synonyms: bow, obeisance |
| bowknot | (noun) a knot with two loops and loose ends; used to tie shoelaces | Synonyms: bow |
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| bowl | (noun) the act of rolling something (as the ball in bowling) | Synonyms: roll |
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| (noun) a dish that is round and open at the top for serving foods | - |
| (noun) a round vessel that is open at the top; used chiefly for holding grains or liquids | - |
| (noun) a small round container that is open at the top for holding tobacco | Synonyms: pipe bowl |
| (noun) a large structure for open-air sports or entertainments | Synonyms: arena, sports stadium, stadium |
| (noun) a wooden ball (with flattened sides so that it rolls on a curved course) used in the game of lawn bowling | - |
| (noun) a large ball with finger holes used in the sport of bowling | Synonyms: bowling ball |
| (noun) the quantity contained in a bowl | Synonyms: bowlful |
| (noun) a concave shape with an open top | Synonyms: trough |
| bowlder | (noun) a large smooth mass of rock detached from its place of origin | Synonyms: boulder |
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| bowleg | (noun) a leg bowed outward at the knee (or below the knee) | Synonyms: bandy leg, bandyleg, bow leg, genu varum, tibia vara |
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| bowler | (noun) a felt hat that is round and hard with a narrow brim | Synonyms: bowler hat, derby, derby hat, plug hat |
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| (noun) a player who rolls balls down an alley at pins | - |
| (noun) a cricketer who delivers the ball to the batsman in cricket | - |
| bowlful | (noun) the quantity contained in a bowl | Synonyms: bowl |
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| bowline | (noun) a loop knot that neither slips nor jams | Synonyms: bowline knot |
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| bowling | (noun) a game in which balls are rolled at an object or group of objects with the aim of knocking them over or moving them | - |
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| (noun) the playing of a game of tenpins or duckpins etc | - |
| (noun) (cricket) the act of delivering a cricket ball to the batsman | - |
| bowls | (noun) a bowling game played on a level lawn with biased wooden balls that are rolled at a jack | Synonyms: lawn bowling |
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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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| bowsprit | (noun) a spar projecting from the bow of a vessel | - |
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| bowstring | (noun) the string of an archer's bow | - |
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| bowtie | (noun) a man's tie that ties in a bow | Synonyms: bow-tie, bow tie |
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| box | (noun) a blow with the hand (usually on the ear) | - |
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| (noun) a (usually rectangular) container; may have a lid | - |
| (noun) separate partitioned area in a public place for a few people | - |
| (noun) private area in a theater or grandstand where a small group can watch the performance | Synonyms: loge |
| (noun) the driver's seat on a coach | Synonyms: box seat |
| (noun) any one of several designated areas on a ball field where the batter or catcher or coaches are positioned | - |
| (noun) evergreen shrubs or small trees | Synonyms: boxwood |
| (noun) the quantity contained in a box | Synonyms: boxful |
| (noun) a rectangular drawing | - |
| (noun) a predicament from which a skillful or graceful escape is impossible | Synonyms: corner |
| boxberry | (noun) spicy red berrylike fruit; source of wintergreen oil | Synonyms: checkerberry, spiceberry, teaberry, wintergreen |
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| (noun) creeping woody plant of eastern North America with shiny evergreen leaves and scarlet berries | Synonyms: Mitchella repens, partridgeberry, twinberry |
| boxcar | (noun) a freight car with roof and sliding doors in the sides | - |
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| boxcars | (noun) (usually plural) an expression used when two dice are thrown and both come up showing six spots | - |
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| boxer | (noun) a breed of stocky medium-sized short-haired dog with a brindled coat and square-jawed muzzle developed in Germany | - |
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| (noun) someone who fights with his fists for sport | Synonyms: pugilist |
| (noun) a workman employed to pack things into containers | Synonyms: bagger, packer |
| boxers | (noun) underpants worn by men | Synonyms: boxershorts, drawers, shorts, underdrawers |
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| boxershorts | (noun) underpants worn by men | Synonyms: boxers, drawers, shorts, underdrawers |
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| boxfish | (noun) any of numerous small tropical fishes having body and head encased in bony plates | Synonyms: trunkfish |
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| boxful | (noun) the quantity contained in a box | Synonyms: box |
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| boxing | (noun) fighting with the fists | Synonyms: fisticuffs, pugilism |
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| (noun) the enclosure of something in a package or box | Synonyms: packing |
| boxthorn | (noun) any of various shrubs or vines of the genus Lycium with showy flowers and bright berries | Synonyms: matrimony vine |
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| boxwood | (noun) evergreen shrubs or small trees | Synonyms: box |
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| (noun) very hard tough close-grained light yellow wood of the box (particularly the common box); used in delicate woodwork: musical instruments and inlays and engraving blocks | Synonyms: Turkish boxwood |
| boy | (noun) a youthful male person | Synonyms: male child |
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| (noun) (ethnic slur) offensive and disparaging term for Black man | - |
| (noun) a friendly informal reference to a grown man | - |
| (noun) a male human offspring | Synonyms: son |
| boycott | (noun) a group's refusal to have commercial dealings with some organization in protest against its policies | - |
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| boyfriend | (noun) a man who is the lover of a man or woman | Synonyms: beau, fellow, swain |
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| boyhood | (noun) the childhood of a boy | - |
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| boyishness | (noun) being characteristic of a boy | - |
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| boysenberry | (noun) large raspberry-flavored fruit; cross between blackberries and raspberries | - |
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| (noun) cultivated hybrid bramble of California having large dark wine-red fruit with a flavor resembling raspberries | Synonyms: boysenberry bush |
| bozo | (noun) an informal term for a youth or man | Synonyms: cat, guy, hombre, sod |
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| (noun) a man who is a stupid incompetent fool | Synonyms: cuckoo, fathead, goof, goofball, goose, jackass, twat, zany |
| breadboard | (noun) a wooden or plastic board on which dough is kneaded or bread is sliced | Synonyms: bread board |
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| breadbox | (noun) a container used to keep bread or cake in | Synonyms: bread-bin |
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| breastbone | (noun) the flat bone that articulates with the clavicles and the first seven pairs of ribs | Synonyms: sternum |
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| bubo | (noun) a lymph node that is inflamed and swollen because of plague or gonorrhea or tuberculosis | - |
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| buckboard | (noun) an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles | - |
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| bugaboo | (noun) a source of concern | - |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugbear |
| bullyboy | (noun) a swaggering tough; usually one acting as an agent of a political faction | - |
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| bumboat | (noun) a small boat that ferries supplies and commodities for sale to a larger ship at anchor | - |
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| burbot | (noun) elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth | Synonyms: cusk, eelpout, ling, Lota lota |
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| busboy | (noun) a restaurant attendant who sets tables and assists waiters and clears away dirty dishes | Synonyms: waiter's assistant |
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| busybody | (noun) a person who meddles in the affairs of others | Synonyms: nosey-parker, nosy-parker, quidnunc |
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| cabochon | (noun) a highly polished gem that is cut convexly but without facets | - |
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| caboodle | (noun) any collection in its entirety | Synonyms: bunch, lot |
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| caboose | (noun) a car on a freight train for use of the train crew; usually the last car on the train | Synonyms: cabin car |
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| (noun) the area for food preparation on a ship | Synonyms: cookhouse, galley, ship's galley |
| cabotage | (noun) navigation in coastal waters | - |
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| (noun) the exclusive right of a country to control the air traffic within its borders | - |
| carambola | (noun) deeply ridged yellow-brown tropical fruit; used raw as a vegetable or in salad or when fully ripe as a dessert | Synonyms: star fruit |
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| (noun) East Indian tree bearing deeply ridged yellow-brown fruit | Synonyms: Averrhoa carambola, carambola tree |
| carbohydrate | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: saccharide, sugar |
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| carbomycin | (noun) a colorless basic antibiotic that inhibits the growth of Gram-positive organisms | - |
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| carbon | (noun) a copy made with carbon paper | Synonyms: carbon copy |
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| (noun) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds | Synonyms: atomic number 6, C |
| (noun) a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper | Synonyms: carbon paper |
| 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 |
| carbonara | (noun) sauce for pasta; contains eggs and bacon or ham and grated cheese | - |
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| carbonate | (noun) a salt or ester of carbonic acid (containing the anion CO3) | - |
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| carbonation | (noun) saturation with carbon dioxide (as soda water) | - |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| carbonisation | (noun) the destructive distillation of coal (as in coke ovens) | Synonyms: carbonization |
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| carbonization | (noun) the destructive distillation of coal (as in coke ovens) | Synonyms: carbonisation |
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| carbonyl | (noun) a compound containing metal combined with carbon monoxide | - |
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| carborundum | (noun) an abrasive composed of silicon carbide crystals | - |
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| carboxyl | (noun) the univalent radical -COOH; present in and characteristic of organic acids | Synonyms: carboxyl group |
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| carboy | (noun) a large bottle for holding corrosive liquids; usually cushioned in a special container | - |
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| cardboard | (noun) a stiff moderately thick paper | Synonyms: composition board |
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| caribou | (noun) Arctic deer with large antlers in both sexes; called `reindeer' in Eurasia and `caribou' in North America | Synonyms: Greenland caribou, Rangifer tarandus, reindeer |
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| casebook | (noun) a book in which detailed written records of a case are kept and which are a source of information for subsequent work | - |
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| cashbox | (noun) a strongbox for holding cash | Synonyms: money box, till |
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| catabolism | (noun) breakdown in living organisms of more complex substances into simpler ones together with release of energy | Synonyms: destructive metabolism, dissimilation, katabolism |
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| catboat | (noun) a sailboat with a single mast set far forward | - |
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| ceibo | (noun) small South American spiny tree with dark crimson and scarlet flowers solitary or clustered | Synonyms: common coral tree, cry-baby tree, crybaby tree, Erythrina crista-galli |
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| centerboard | (noun) a retractable fin keel used on sailboats to prevent drifting to leeward | Synonyms: centreboard, drop keel, sliding keel |
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| centreboard | (noun) a retractable fin keel used on sailboats to prevent drifting to leeward | Synonyms: centerboard, drop keel, sliding keel |
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| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| chatterbox | (noun) an obnoxious and foolish and loquacious talker | Synonyms: babbler, chatterer, magpie, prater, spouter |
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| (noun) orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf | Synonyms: Epipactis gigantea, giant helleborine, stream orchid |
| checkbook | (noun) a book issued to holders of checking accounts | Synonyms: chequebook |
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| checkerboard | (noun) a board having 64 squares of two alternating colors | Synonyms: checker board, chequerboard |
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| cheekbone | (noun) the arch of bone beneath the eye that forms the prominence of the cheek | Synonyms: jugal bone, malar, malar bone, os zygomaticum, zygomatic, zygomatic bone |
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| cheeseboard | (noun) tray on which cheeses are served | Synonyms: cheese tray |
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| chequebook | (noun) a book issued to holders of checking accounts | Synonyms: checkbook |
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| chequerboard | (noun) a board having 64 squares of two alternating colors | Synonyms: checker board, checkerboard |
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| chessboard | (noun) a checkerboard used to play chess | Synonyms: chess board |
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