Definition of rad

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< racy

rad >

rad ¹

d) KEY

NOUN:

A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joules per kilogram of irradiated material. It has been replaced as a standard scientific unit by the gray.

ETYMOLOGY:
r(adiation) a(bsorbed) d(ose)

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The American Heritage® Dictionary of the English Language, Fourth Edition.
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