An apparatus or structure in which fissile material can be made to undergo a controlled, self-sustaining nuclear reaction with the consequent release of energy
A container or apparatus in which substances are made to react chemically, esp. one in an industrial plant
A person who shows an immune response to a specific antigen or an adverse reaction to a drug or other substance
A coil or other component that provides reactance in a circuit
one that reacts (to respond to a stimulus) [n REACTORS]