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Word of the Day: Catachrestical

Irradiance [\N] Webster's Dictionary 1828

1. IRRA'DIANCE

2. IRRA'DIANCY, noun [Latin irradians, from irradio. See Irradiate .]

3. Emission of rays of light on an object.

4. Beams of light emitted; luster; splendor.

Irradiance [Noun] Webster's Dictionary 1913

Alt. of Irradiancy