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.
Oxford English vocab. Оксфордский английский словарь. 2012