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radiation
Part of speech: NounThe coming forth and spreading, as of rays, in all directions from a common center; as, the radiation of light or heat from a shining or heated body.
Usage examples "radiation":- The broad leaves of R. Hodgsoni were curled, from the expansion of the frozen fluid in the layer of cells on the upper surface of the leaf, which is exposed to the greatest cold of radiation. - "Himalayan Journals V2.", J. D. Hooker.
- Everything else equal, it should have been pretty much Terra type; closer to a cooler primary and getting about the same amount of radiation. - "Four-Day Planet", Henry Beam Piper.
- Instruments will record and transmit vital information to the earth- the effect of cosmic rays, solar radiation, fuel required for course corrections, and many other items. - "The Flying Saucers are Real", Donald Keyhoe.