| baryon | (noun) any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1 | Synonyms: heavy particle |
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| barytone | (noun) a male singer | Synonyms: baritone |
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| bassoon | (noun) a double-reed instrument; the tenor of the oboe family | - |
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| bassoonist | (noun) a musician who plays the bassoon | - |
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| bastardisation | (noun) an act that debases or corrupts | Synonyms: bastardization |
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| bastardization | (noun) an act that debases or corrupts | Synonyms: bastardisation |
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| (noun) declaring or rendering bastard | - |
| bastion | (noun) projecting part of a rampart or other fortification | - |
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| (noun) a stronghold into which people could go for shelter during a battle | Synonyms: citadel |
| (noun) a group that defends a principle | - |
| bastioned | (adjective) secured with bastions or fortifications | Synonyms: fortified |
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| baton | (noun) a thin tapered rod used by a conductor to lead an orchestra or choir | Synonyms: wand |
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| (noun) a hollow cylinder passed from runner to runner in a relay race | - |
| (noun) a hollow metal rod that is wielded or twirled by a drum major or drum majorette | - |
| (noun) a short staff carried by some officials to symbolize an office or an authority | - |
| (noun) a short stout club used primarily by policemen | Synonyms: billy, billy club, billystick, nightstick, truncheon |
| battalion | (noun) an army unit usually consisting of a headquarters and three or more companies | - |
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| (noun) a large indefinite quantity | Synonyms: large number, multitude, pack, plurality |
| battlefront | (noun) the line along which opposing armies face each other | Synonyms: front, front line |
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| battlewagon | (noun) large and heavily armoured warship | Synonyms: battleship |
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| bayonet | (noun) a knife that can be fixed to the end of a rifle and used as a weapon | - |
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| (verb) stab or kill someone with a bayonet | - |
| bazillion | (noun) a very large indefinite number (usually hyperbole) | Synonyms: billion, gazillion, jillion, million, trillion, zillion |
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| beachfront | (noun) a strip of land running along a beach | - |
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| beacon | (noun) a radio station that broadcasts a directional signal for navigational purposes | Synonyms: radio beacon |
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| (noun) a tower with a light that gives warning of shoals to passing ships | Synonyms: beacon light, lighthouse, pharos |
| (noun) a fire (usually on a hill or tower) that can be seen from a distance | Synonyms: beacon fire |
| (verb) guide with a beacon | - |
| (verb) shine like a beacon | - |
| beatification | (noun) (Roman Catholic Church) an act of the Pope who declares that a deceased person lived a holy life and is worthy of public veneration; a first step toward canonization | - |
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| (noun) the action of rendering supremely blessed and extremely happy | - |
| (noun) a state of supreme happiness | Synonyms: beatitude, blessedness |
| beautification | (noun) the act of making something more beautiful | - |
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| beckon | (verb) signal with the hands or nod | Synonyms: wave |
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| (verb) summon with a wave, nod, or some other gesture | - |
| (verb) appear inviting | - |
| begonia | (noun) any of numerous plants of the genus Begonia grown for their attractive glossy asymmetrical leaves and colorful flowers in usually terminal cymes or racemes | - |
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| belladonna | (noun) an alkaloidal extract or tincture of the poisonous belladonna plant that is used medicinally | - |
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| (noun) perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine | Synonyms: Atropa belladonna, belladonna plant, deadly nightshade |
| bellybutton | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, navel, omphalos, omphalus, umbilicus |
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| belong | (verb) be owned by; be in the possession of | - |
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| (verb) be rightly classified in a class or category | - |
| (verb) be suitable or acceptable | - |
| (verb) be in the right place or situation | Synonyms: go |
| (verb) be a part or adjunct | Synonyms: belong to |
| (verb) be a member, adherent, inhabitant, etc. (of a group, organization, or place) | - |
| belonging | (noun) happiness felt in a secure relationship | - |
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| belongings | (noun) something owned; any tangible or intangible possession that is owned by someone | Synonyms: holding, property |
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| benediction | (noun) the act of praying for divine protection | Synonyms: blessing |
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| (noun) a ceremonial prayer invoking divine protection | Synonyms: blessing |
| benefaction | (noun) an act intending or showing kindness and good will | Synonyms: benevolence |
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| (noun) a contribution of money or assistance | - |
| beneficiation | (noun) crushing and separating ore into valuable substances or waste by any of a variety of techniques | Synonyms: mineral dressing, mineral extraction, mineral processing, ore dressing, ore processing |
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| benison | (noun) a spoken blessing | - |
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| benthonic | (adjective) of or relating to or happening on the bottom under a body of water | Synonyms: benthal, benthic |
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| bentonite | (noun) an absorbent aluminum silicate clay formed from volcanic ash | - |
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| bentonitic | (adjective) of or relating to or containing bentonite | - |
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| benzoquinone | (noun) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes | Synonyms: quinone |
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| betatron | (noun) accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux | Synonyms: induction accelerator |
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| bettong | (noun) short-nosed rat kangaroo | - |
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| bevatron | (noun) a cyclotron that accelerates protons up to several billion electron volts | - |
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| beyond | (adverb) over and above | - |
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| (adverb) farther along in space or time or degree | - |
| (adverb) on the farther side from the observer | - |
| bicarbonate | (noun) a salt of carbonic acid (containing the anion HCO3) in which one hydrogen atom has been replaced; an acid carbonate | Synonyms: hydrogen carbonate |
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| biconcave | (adjective) concave on both sides | Synonyms: concavo-concave |
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| biconvex | (adjective) convex on both sides; shaped like a lentil | Synonyms: convexo-convex, lenticular, lentiform |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| bifurcation | (noun) the act of splitting into two branches | - |
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| (noun) the place where something divides into two branches | - |
| (noun) a bifurcating branch (one or both of them) | - |
| bignoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Bignoniaceae | - |
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| bignoniad | (noun) any woody plant of the family Bignoniaceae | - |
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| bilestone | (noun) a calculus formed in the gall bladder or its ducts | Synonyms: gallstone |
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| billabong | (noun) a branch of a river made by water flowing from the main stream only when the water level is high | - |
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| (noun) a stagnant pool of water in the bed of a stream that flows intermittently | - |
| billion | (adjective) denoting a quantity consisting of one thousand million items or units in the United States | - |
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| (adjective) denoting a quantity consisting of one million million items or units in Great Britain | - |
| (noun) the number that is represented as a one followed by 9 zeros | Synonyms: 1000000000, one thousand million |
| (noun) the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen | Synonyms: 1000000000000, one million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, gazillion, jillion, million, trillion, zillion |
| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| biltong | (noun) meat that is salted and cut into strips and dried in the sun | - |
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| bimonthly | (adjective) occurring every two months | Synonyms: bimestrial |
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| (adjective) occurring twice a month | Synonyms: semimonthly |
| (noun) a periodical that is published twice a month or every two months (either 24 or 6 issues per year) | - |
| (adverb) every two months | - |
| (adverb) twice a month | Synonyms: semimonthly |
| binturong | (noun) arboreal civet of Asia having a long prehensile tail and shaggy black hair | Synonyms: Arctictis bintourong, bearcat |
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| bionic | (adjective) of or relating to bionics | - |
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| (adjective) having particular physiological functions augmented or replaced by electronic or electromechanical components | - |
| bionics | (noun) application of biological principles to the study and design of engineering systems (especially electronic systems) | - |
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| bionomic | (adjective) of or relating to the science of ecology | Synonyms: bionomical, ecologic, ecological |
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| bionomical | (adjective) of or relating to the science of ecology | Synonyms: bionomic, ecologic, ecological |
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| bionomics | (noun) the branch of biology concerned with the relations between organisms and their environment | Synonyms: ecology, environmental science |
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| biont | (noun) a discrete unit of living matter | - |
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| bioremediation | (noun) the act of treating waste or pollutants by the use of microorganisms (as bacteria) that can break down the undesirable substances | - |
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| (noun) the branch of biotechnology that uses biological process to overcome environmental problems | - |
| bioweapon | (noun) any weapon usable in biological warfare | Synonyms: bioarm, biological weapon |
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| birdsong | (noun) the characteristic sound produced by a bird | Synonyms: birdcall, call, song |
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| bisection | (noun) dividing into two equal parts | - |
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| bisectional | (adjective) of or relating to bisection | - |
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| bison | (noun) any of several large humped bovids having shaggy manes and large heads and short horns | - |
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| bisontine | (adjective) relating to or characteristic of bison | - |
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| bizonal | (adjective) relating to or concerned with the combined affairs of two administrative zones | - |
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| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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| blazon | (noun) the official symbols of a family, state, etc. | Synonyms: arms, blazonry, coat of arms |
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| (verb) decorate with heraldic arms | Synonyms: emblazon |
| blazonry | (noun) the official symbols of a family, state, etc. | Synonyms: arms, blazon, coat of arms |
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| blond | (adjective) being or having light colored skin and hair and usually blue or grey eyes | Synonyms: blonde, light-haired |
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| (noun) a light grayish yellow to near white | Synonyms: blonde |
| (noun) a male person with fair skin and hair | - |
| blonde | (adjective) being or having light colored skin and hair and usually blue or grey eyes | Synonyms: blond, light-haired |
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| (noun) a light grayish yellow to near white | Synonyms: blond |
| (noun) a female person with fair skin and hair | - |
| blondness | (noun) the property of having a naturally light complexion | Synonyms: fairness, paleness |
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| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| bludgeon | (noun) a club used as a weapon | - |
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| (verb) strike with a club or a bludgeon | Synonyms: club |
| (verb) overcome or coerce as if by using a heavy club | - |
| bludgeoner | (noun) an assailant who uses a bludgeon | - |
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| bluebonnet | (noun) a brimless dark blue Scottish cap with a flat top and a plume on one side | Synonyms: Balmoral |
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| (noun) low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States | Synonyms: buffalo clover, Lupinus subcarnosus, Texas bluebonnet |
| bluestone | (noun) bluish-grey sandstone used for paving and building | - |
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| bluetongue | (noun) a viral disease of sheep and cattle that is transmitted by biting midges | - |
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| bocconia | (noun) small Central American tree having loose racemes of purple-tinted green flowers | Synonyms: Bocconia frutescens, tree celandine |
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| (noun) herb of China and Japan widely cultivated for its plumelike panicles of creamy white flowers | Synonyms: Macleaya cordata, plume poppy |
| boloney | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| bombardon | (noun) a large shawm; the bass member of the shawm family | Synonyms: bombard |
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| (noun) a tuba that coils over the shoulder of the musician | Synonyms: helicon |
| bombilation | (noun) sound of rapid vibration | Synonyms: bombination, buzz |
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| bombination | (noun) sound of rapid vibration | Synonyms: bombilation, buzz |
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| bonanza | (noun) a sudden happening that brings good fortune (as a sudden opportunity to make money) | Synonyms: boom, bunce, godsend, gold rush, gravy, manna from heaven, windfall |
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| (noun) an especially rich vein of precious ore | - |
| bonavist | (noun) perennial twining vine of Old World tropics having trifoliate leaves and racemes of fragrant purple pea-like flowers followed by maroon pods of edible seeds; grown as an ornamental and as a vegetable on the Indian subcontinent; sometimes placed in genus Dolichos | Synonyms: Dolichos lablab, Egyptian bean, hyacinth bean, Indian bean, Lablab purpureus |
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| bonbon | (noun) a candy that usually has a center of fondant or fruit or nuts coated in chocolate | - |
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| bonce | (noun) informal terms for a human head | Synonyms: attic, bean, dome, noggin, noodle |
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| bond | (noun) a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner) | Synonyms: hamper, shackle, trammel |
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| (noun) a connection that fastens things together | Synonyms: attachment |
| (noun) the property of sticking together (as of glue and wood) or the joining of surfaces of different composition | Synonyms: adherence, adhesion, adhesiveness |
| (noun) an electrical force linking atoms | Synonyms: chemical bond |
| (noun) a certificate of debt (usually interest-bearing or discounted) that is issued by a government or corporation in order to raise money; the issuer is required to pay a fixed sum annually until maturity and then a fixed sum to repay the principal | Synonyms: bond certificate |
| (noun) (criminal law) money that must be forfeited by the bondsman if an accused person fails to appear in court for trial | Synonyms: bail, bail bond |
| (noun) a connection based on kinship or marriage or common interest | Synonyms: alliance |
| (noun) a superior quality of strong durable white writing paper; originally made for printing documents | Synonyms: bond paper |
| (verb) stick to firmly | Synonyms: adhere, bind, hold fast, stick, stick to |
| (verb) bring together in a common cause or emotion | Synonyms: draw together |
| (verb) issue bonds on | - |
| (verb) create social or emotional ties | Synonyms: attach, bind, tie |
| bondable | (adjective) capable of holding together or cohering; as particles in a mass | - |
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| (adjective) capable of being fastened or secured with a rope or bond | Synonyms: bindable |
| bondage | (noun) sexual practice that involves physically restraining (by cords or handcuffs) one of the partners | - |
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| (noun) the state of being under the control of another person | Synonyms: slavery, thraldom, thrall, thralldom |
| (noun) the state of being under the control of a force or influence or abstract power | - |
| bonderise | (verb) coat with a substance that will prevent corrosion | Synonyms: bonderize |
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| bonderize | (verb) coat with a substance that will prevent corrosion | Synonyms: bonderise |
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| bondholder | (noun) a holder of bonds issued by a government or corporation | - |
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| bonding | (noun) fastening firmly together | Synonyms: soldering |
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| (noun) (dentistry) a technique for repairing a tooth; resinous material is applied to the surface of the tooth where it adheres to the tooth's enamel | - |
| (noun) a close personal relationship that forms between people (as between husband and wife or parent and child) | - |
| bondmaid | (noun) a female slave | Synonyms: bondswoman, bondwoman |
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| (noun) a female bound to serve without wages | Synonyms: bondswoman, bondwoman |
| bondman | (noun) a male slave | Synonyms: bondsman |
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| (noun) a male bound to serve without wages | Synonyms: bondsman |
| bondsman | (noun) a male slave | Synonyms: bondman |
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| (noun) a male bound to serve without wages | Synonyms: bondman |
| (noun) a male who signs a bond as surety for someone else | - |
| bondsperson | (noun) someone who signs a bond as surety for someone else | - |
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| bondswoman | (noun) a female slave | Synonyms: bondmaid, bondwoman |
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| (noun) a female bound to serve without wages | Synonyms: bondmaid, bondwoman |
| (noun) a female who signs a bond as surety for someone else | - |