1. [ noun ] (physics) the physical phenomenon of radiating energy in the form of waves or particles
Related terms: energy physical_phenomenon radioactivity solar_radiation corpuscular_radiation ionizing_radiation electromagnetic_radiation beta_radiation alpha_radiation cosmic_radiation neutron_radiation radiate
2. [ noun ] (physics) the act of spreading outward from a central source
Related terms: emission bombardment radiate
3. [ noun ] (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
Synonyms: radiation_therapy actinotherapy irradiation radiotherapy
Related terms: therapy radium_therapy X-ray_therapy phototherapy medicine
4. [ noun ] (anatomy,zoology) a radial arrangement of nerve fibers connecting different parts of the brain
Related terms: neural_structure radiate
5. [ noun ] (physics) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
Synonyms: activity radioactivity
Related terms: inactivity act emission practice variation corpuscular_radiation space_walk
6. [ noun ] (medicine) 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; severe exposure can cause death within hours
Synonyms: radiation_syndrome radiation_sickness
Related terms: syndrome
7. [ noun ] the spread of a group of organisms into new habitats
Related terms: natural_process spread adaptive_radiation
Similar spelling:   radiating