n.
1.energy that is radiated or transmitted in the form of rays or waves or particles
2.the act of spreading outward from a central source
3.syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions)
4.the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
5.the spread of a group of organisms into new habitats
6.a radial arrangement of nerve fibers connecting different parts of the brain
7.(medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
Idiom of the Day
stick to the facts
to remain faithful to the facts about something
"Please stick to the facts when you tell the story to the police."
