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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]
bethink to think about; consider (usu. used reflexively). [2 definitions]
Bethlehem a hill town north of Jerusalem in Israeli-occupied Jordan, traditionally considered the birthplace of Jesus Christ.
betide to happen to; befall. [2 definitions]
betimes before the time that is necessary, expected, or customary; early.
betoken to be a token or sign of.
betook past tense of betake.
betray to be disloyal to; commit treason against. [5 definitions]
betroth to pledge or give in marriage.
betrothal the act or fact of being mutually pledged to marry; engagement.