|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a. the emission or transfer of radiant energy as particles, electromagnetic waves, sound, etc|
|b. the particles, etc, emitted, esp the particles and gamma rays emitted in nuclear decay|
|2.||med Also called: radiation therapy treatment using a radioactive substance|
|3.||anatomy a group of nerve fibres that diverge from their common source|
|4.||See adaptive radiation|
|5.||the act, state, or process of radiating or being radiated|
|6.||surveying the fixing of points around a central plane table by using an alidade and measuring tape|
radiation ra·di·a·tion (rā'dē-ā'shən)
The act or condition of diverging in all directions from a center.
The emission and propagation of energy in the form of rays or waves.
The energy radiated or transmitted in the form of rays, waves, or particles.
A stream of particles or electromagnetic waves that is emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
The radial arrangement of anatomical or histological parts.
The spread of a group of organisms into new habitats.
|radiation (rā'dē-ā'shən) Pronunciation Key