radioiodine ra·di·o·i·o·dine (rā'dē-ō-ī'ə-dīn')
n.
A radioactive isotope of iodine widely used as a tracer.
| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
| an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language. |