n. [ Gr.
n. [ From beta, generic name of the beet. ] (Chem.) A nitrogenous base,
v. t.
They betook themselves to treaty and submission. Burke. [ 1913 Webster ]
The rest, in imitation, to like arms
Betook them. Milton. [ 1913 Webster ]
Whither shall I betake me, where subsist? Milton. [ 1913 Webster ]
(Physics) a form of ionizing radiation emitted by radioactive substances (such as radium), more penetrating than alpha rays, and consisting of negatively charged electrons. The electrons are the same kind of particle as those of cathode rays, but have much higher velocities (about 35, 000 to 180, 000 miles per second). They are readily deflected by a magnetic or electric field. [ Webster 1913 Suppl. ]
n. a type of particle accelerator which accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux.
pos>a. [ p. p. of OE. bitechen, AS. bet&aemacr_;can, to assign, deliver. See Teach. ] Delivered; committed in trust. [ Obs. ] [ 1913 Webster ]