Meaning of REACTOR in English

noun Date: 1890 one that reacts, a device (as a coil, winding, or conductor of small resistance) used to introduce reactance into an alternating-current circuit, 3. a vat for an industrial chemical reaction, a device for the controlled release of nuclear energy (as for producing heat)

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.