What word or phrase does your mother always say?
betatron be·ta·tron (bā'tə-trŏn', bē'-)
A magnetic induction device capable of accelerating electrons to energies of several hundred million electron volts.
A type of particle accelerator that uses changing magnetic fields to accelerate electrons. Energies of several hundred million electron volts can be achieved in a betatron. See also particle accelerator.