re·ac·tor 
(rē-ăktər)
(rē-ăktər)n.
1. One that reacts to a stimulus.
2. Electronics A circuit element, such as a coil, used to introduce reactance.
3.
a. A chemical reactor.
b. A nuclear reactor.
- reformist
- Reform Judaism
- reform school
- refoule
- refoulement
- refract
- refracting telescope
- refraction
- refractional
- refractive
- refractive index
- refractively
- refractiveness
- refractivity
- refractometer
- refractor
- refractorily
- refractoriness
- refractory
- refrain
- refrain
- refrainer
- refrainment
- refrangibility
- refrangible