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radiation belt
radiation biology
radiation oncology
radiation pressure
radiation sickness
radiation therapy
radiational cooling
radiative collision
radiative forcing
radiator
radical
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radiance

ra·di·ance [ ráydee ənss ]


noun 
Definition:
 
1. happiness or energy: joy, energy, or good health discernible in somebody's face or demeanor

2. light: bright or glowing light

3. physics measure of radiant energy: a measure of the amount of radiant energy emitted or received per unit area of a surface over a specific time.
Symbol  Le


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