radioisotope

noun

ra·​dio·​iso·​tope ˌrā-dē-ō-ˈī-sə-ˌtōp 

: a radioactive isotope

radioisotopic

ˌrā-dē-ō-ˌī-sə-ˈtä-pik 

-ˈtō-

adjective

radioisotopically

ˌrā-dē-ō-ˌī-sə-ˈtä-pi-k(ə-)lē 

adverb

Examples of radioisotope in a Sentence

Recent Examples on the Web

Voyager 1 is slowly losing power The spacecraft is powered by three radioisotope thermoelectric generators. —George Petras, USA Today, 25 Nov. 2025

Plutonium-238 is packed inside radioisotope thermoelectric generators, or RTGs. —Kaif Shaikh, Interesting Engineering, 14 Nov. 2025

With the advent of the Facility for Rare Isotope Beams and other accelerator facilities, the search for new radioisotopes will continue opening doors to a world of possibilities. —Andrea Richard, The Conversation, 2 Oct. 2025

If the diagnostic scan confirms a match, the same targeting molecule is paired with a therapeutic radioisotope and given to the patient. —Rowan Briggs, Mercury News, 27 Aug. 2025

Word History

Etymology

International Scientific Vocabulary

First Known Use

1938, in the meaning defined above

Rhymes for radioisotope

• antelope
• bronchoscope
• cantaloupe
• cystoscope
• endoscope
• envelope
• epitope
• gyroscope
• horoscope
• isotope
• microscope
• misanthrope

Kids Definition

radioisotope

noun

ra·​dio·​iso·​tope ˌrād-ē-ō-ˈī-sə-ˌtōp 

: a radioactive isotope

Medical Definition

radioisotope

noun

ra·​dio·​iso·​tope ˌrād-ē-ō-ˈī-sə-ˌtōp 

: a radioactive isotope compare radioelement

radioisotopic

-ˌī-sə-ˈtäp-ik, -ˈtōp-ik 

adjective

radioisotopically

-i-k(ə-)lē 

adverb