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radial drilling machine
radial engine
radial keratotomy
radial-ply
radial symmetry
radial tire
radial velocity
radian
radiance
radiant
radiant energy
radiant flux
radiant heat
radiant heating
radiate
radiation
radiation belt
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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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