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best man the bridegroom's principal attendant at a wedding.
bestow to give, as a gift or award (usu. fol. by on). [2 definitions]
bestrew to scatter over or cover; strew. [2 definitions]
bestride to be astride of; straddle. [3 definitions]
bestseller a book or other product that outsells most others of its kind during a specified period.
bet to agree to give up (usu. money) to another person if one's prediction of some future result does not occur. [7 definitions]
beta the name of the second letter of the Greek alphabet.
beta blocker any of a class of drugs that inhibit the absorption of adrenalin and the activity of the autonomic nervous system, and are used to control the heartbeat and relieve angina and hypertension.
betake to take (usu. oneself) somewhere.
beta particle a high-speed positron or electron ejected from a nucleus in radioactive decay or fission.
beta ray a stream of beta particles, esp. those with a negative charge.
betatron in physics, an electron accelerator in which the speed of the electrons is increased to high energies, from a few million to a few hundred million electron volts, by the action of a rapidly changing magnetic field.
betel a climbing East Indian pepper plant. [2 definitions]
Betelgeuse a red variable star in the constellation Orion, having a magnitude of 0.7.
betel nut the nut of the betel palm, chewed together with betel pepper leaves and lime in southeastern Asia as a mild stimulant and narcotic.
betel palm a tall palm tree of the Asian tropics that has feathery leaves and produces orange or red fruit and the betel nut.
betel pepper a climbing plant of tropical Asia; betel.
bÍte noire black beast (French); someone or something that a person intensely dislikes, fears, or avoids.
beth the name of the second letter of the Hebrew alphabet.
bethel a holy place or religious sanctuary. [2 definitions]
bethink to think about; consider (usu. used reflexively). [2 definitions]