| 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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| bevatron | (noun) a cyclotron that accelerates protons up to several billion electron volts | - |
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| bevel | (noun) a hand tool consisting of two rules that are hinged together so you can draw or measure angles of any size | Synonyms: bevel square |
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| (noun) two surfaces meeting at an angle different from 90 degrees | Synonyms: cant, chamfer |
| beverage | (noun) any liquid suitable for drinking | Synonyms: drink, drinkable, potable |
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| bevy | (noun) a flock of birds (especially when gathered close together on the ground) | - |
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| (noun) a large gathering of people of a particular type | - |
| bewilderment | (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bemusement, mystification, obfuscation, puzzlement |
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| bewitchery | (noun) magnetic personal charm | Synonyms: animal magnetism, beguilement |
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| bewitchment | (noun) a magical spell | Synonyms: enchantment |
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| bey | (noun) the governor of a district or province in the Ottoman Empire | - |
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| (noun) (formerly) a title of respect for a man in Turkey or Egypt | - |
| bezant | (noun) a gold coin of the Byzantine Empire; widely circulated in Europe in the Middle Ages | Synonyms: bezzant, byzant, solidus |
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| bezel | (noun) a sloping edge on a cutting tool | - |
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| bezique | (noun) a card game played with a pack of forty-eight cards (two of each suit for high cards); play resembles whist | Synonyms: penuchle, pinochle, pinocle |
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| bezzant | (noun) a gold coin of the Byzantine Empire; widely circulated in Europe in the Middle Ages | Synonyms: bezant, byzant, solidus |
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