Definition of reactors:
(n) :
(chemistry, engineering) A structure used to contain chemical or other reactions.
(n) :
(nuclear physics) A device which uses atomic energy to produce heat.
(n) :
A person who responds to a suggestion, stimulation or other influence.
(n) :
(chemistry) A chemical substance which responds to the presence of, or contact with, another substance.
(n) :
(electronics) An electrical component with reactance