n.

1. 起反應的人
2. 反應裝置
3. 原子爐；核反應堆

n.

1. (also nuclear reactor) 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.
2. a container or apparatus in which substances are made to react chemically.
3. Medicine  a person who reacts to a drug, antigen, etc.
4. Physics  a coil or other component which provides reactance in a circuit.