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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" or "upon"). [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. [3 definitions]
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.
beta-carotene a molecule of the carotene family that has a red-orange color and is abundant in plants.
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 (French) black beast; someone or something that is intensely disliked or feared.
beth the name of the second letter of the Hebrew alphabet.
bethel a holy place or religious sanctuary. [2 definitions]