Category: R

Describes an experiment or clinical trial in which animal or human subjects are assigned by chance to separate groups that compare different treatments.  

Treatment of disease, especially certain forms of cancer, by radiation given off by special machines or by radioactive isotopes. The radiation interferes with the division (mitosis) of cells and the synthesis of deoxyribonucleic acid (DNA) in the cells. Many cancer cells are destroyed by radiation; the major disadvantage is possible damage to cells and tissues…

Any compound that has been joined with a radioactive substance.  

Giving off radiation. The emission of particles during the disintegration of the nuclei of radioactive elements. The emissions include alpha particles, beta particles, and gamma rays. With a nucleus which disintegrates and gives off energy in the form of radiation which can pass through other substances. Capable of spontaneous emission of alpha, beta, or gamma…

The use of high-energy radiation from x-rays, gamma rays, neutrons, and other sources to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body (external-beam radiation therapy), or it may come from radioactive material placed in the body in the area near cancer cells (internal radiation therapy, implant radiation, or…

Radially symmetric.  

(Colour) reddish-brown.  

Breaking, bursting.  

Growing on rocks or walls.