| bet | (noun) the act of gambling | Synonyms: wager |
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| (noun) the money risked on a gamble | Synonyms: stake, stakes, wager |
| beta | (noun) the 2nd letter of the Greek alphabet | - |
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| betaine | (noun) a sweet tasting alkaloid that occurs in sugar beets | - |
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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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| betel | (noun) Asian pepper plant whose leaves are chewed with betel nut (seed of the betel palm) by southeast Asians | Synonyms: betel pepper, Piper betel |
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| (noun) a leaf of a vine from the betel pepper | Synonyms: betel leaf |
| beth | (noun) the 2nd letter of the Hebrew alphabet | - |
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| bethel | (noun) a house of worship (especially one for sailors) | - |
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| betise | (noun) a stupid mistake | Synonyms: folly, foolishness, imbecility, stupidity |
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| betrayal | (noun) an act of deliberate betrayal | Synonyms: perfidy, treachery, treason |
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| (noun) the quality of aiding an enemy | - |
| betrayer | (noun) a person who says one thing and does another | Synonyms: double-crosser, double-dealer, traitor, two-timer |
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| (noun) one who reveals confidential information to the police or other authority | Synonyms: blabber, informer, rat, squealer |
| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| betrothed | (noun) the person to whom you are engaged | - |
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| better | (noun) something superior in quality or condition or effect | - |
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| (noun) the superior one of two alternatives | - |
| (noun) someone who bets | Synonyms: bettor, punter, wagerer |
| (noun) a superior person having claim to precedence | - |
| betterment | (noun) the act of relieving ills and changing for the better | Synonyms: amelioration, melioration |
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| (noun) a change for the better; progress in development | Synonyms: advance, improvement |
| (noun) an improvement that adds to the value of a property or facility | - |
| bettong | (noun) short-nosed rat kangaroo | - |
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| bettor | (noun) someone who bets | Synonyms: better, punter, wagerer |
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| betweenbrain | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: diencephalon, interbrain, thalmencephalon |
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