- reform
- reform school
- reformat
- reformation
- reformatory
reformed
- reformulate
- refortify
- refound
- refract
- refracting
- refracting power
- refraction
- refraction index
- refraction law
- refractive
- refractive angle
- refractive fading
- refractive index
- refractive index distribution
- refractivity
- refractivity conditions
- refractivity gradient
- refractivity N
- refractometer
- refractory
- refrain
- refrain from
- reframe
- reframing
- refreeze

