- a person or thing that reacts or undergoes reaction.
- a device whose primary purpose is to introduce reactance into a circuit.
- a patient or animal that reacts positively towards a foreign material.
- nuclear reactor.
- (especially in industry) a large container, as a vat, for processes in which the substances involved undergo a chemical reaction.
- a substance, such as a reagent, that undergoes a reaction
- short for nuclear reactor
- a vessel, esp one in industrial use, in which a chemical reaction takes place
- a coil of low resistance and high inductance that introduces reactance into a circuit
- a person sensitive to a particular drug or agent
