Meaning of REACTOR in English

n. 1 a person or thing that reacts. 2 (in full nuclear reactor) an apparatus or structure in which a controlled nuclear chain reaction releases energy. 3 Electr. a component used to provide reactance, esp. an inductor. 4 an apparatus for the chemical reaction of substances. 5 Med. a person who has a reaction to a drug etc.

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.