Able to withstand high doses of ionizing radiation without serious injury, as demonstrated by certain bacteria such as Micrococcus radiodurans. The organism shown here is Deinococcus radiodurans.
Resistant to radiation therapy. ... (16 Dec 1997) ... 
Type: Term Pronunciation: rā′dē-ō-rē-zis′tănt Definitions: 1. Indicates cells or tissues that are less affected than average mammalian cells on exposure to radiation; when applied to neoplasms, indicates less susceptibility to damage from therapeutic radiation than the surrounding host tissues.