ra·di·o·bi·ol·o·gy 
(rā′dē-ō-bī-ŏlə-jē)
(rā′dē-ō-bī-ŏlə-jē)n.
1. The study of the effects of radiation on living organisms.
2. The use of radioactive tracers to study biological processes.
ra′di·o·bi′o·logi·cal (-ə-lŏjĭ-kəl) adj.
ra′di·o·bi·olo·gist n.