noun
A unit of energy used in physics, equal to the energy gained by an electron when accelerated through a potential difference of one volt.
この粒子のエネルギーは約5エレクトロンボルトです。
The energy of this particle is about 5 electron volts.
Variant with interpunct, sometimes used for clarity.
ボルト is the unit of electric potential, while エレクトロンボルト is a unit of energy.
Borrowed from English 'electron volt'.