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

Engineers are also working on the advanced radioisotope thermoelectric generators to maximize power output for deep-space environments. — Mrigakshi Dixit, Interesting Engineering, 7 Nov. 2026

Solar power and radioisotopes are seen as the shorter-term power solution on the moon with nuclear microreactors considered the permanent fix. — Jordan Blum, Fortune, 25 Oct. 2026

Some of these radioisotopes enter the solar system to fall on all the planets and moons, including Earth and its moon. — Keith Cooper, Space.com, 2 Sep. 2026

For example, unlike plutonium, which has been used in nuclear batteries deployed in Mars rovers and deep space probes, tritium is considered a relatively low-risk radioisotope. — Tereza Pultarova, IEEE Spectrum, 10 Aug. 2026

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