Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun radiation

7 senses of radiation

Sense 1
radiation -- (energy that is radiated or transmitted in the form of rays or waves or particles)
       => energy, free energy -- ((physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms")

Sense 2
radiation -- (the act of spreading outward from a central source)
       => emission, emanation -- (the act of emitting; causing to flow forth)

Sense 3
radiation sickness, radiation syndrome, radiation -- (syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours; "he was suffering from radiation")
       => syndrome -- (a pattern of symptoms indicative of some disease)

Sense 4
radiation, radioactivity -- (the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay)
       => emission -- (the release of electrons from parent atoms)

Sense 5
radiation -- (the spread of a group of organisms into new habitats)
       => natural process, natural action, action, activity -- (a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity")
       => spread, spreading -- (process or result of distributing or extending over a wide expanse of space)

Sense 6
radiation -- (a radial arrangement of nerve fibers connecting different parts of the brain)
       => neural structure -- (a structure that is part of the nervous system)

Sense 7
radiotherapy, radiation therapy, radiation, actinotherapy, irradiation -- ((medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance)
       => therapy -- ((medicine) the act of caring for someone (as by medication or remedial training etc.); "the quarterback is undergoing treatment for a knee injury"; "he tried every treatment the doctors suggested"; "heat therapy gave the best relief")