be·ta·tron 
(bātə-trŏn′, bē-)
(bātə-trŏn′, bē-)n.
A magnetic induction electron accelerator capable of accelerating electrons to energies of several hundred million electron volts.
- apotheosize
- apotropaic
- apotropaically
- app
- APP
- Appalachia
- Appalachian
- Appalachian dulcimer
- Appalachian Mountains
- Appalachian Trail
- appall
- appalling
- appallingly
- Appaloosa
- appanage
- apparat
- apparatchik
- apparatus
- apparel
- apparent
- apparent horizon
- apparently
- apparent magnitude
- apparentness
- apparent temperature