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ra·di·a·tion

radiation

 
 
pronunciation:
reI di eI shn
features:
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part of speech: noun
definition: the waves of energy sent out by sources of heat or light, or by radioactive material.
She wore a hat to protect her skin from the radiation of the sun.Many people are concerned about radiation from nuclear waste.
derivation: radiational (adj.)
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See
  light