ra·​dio·​im·​mu·​no·​as·​say ˌrā-dē-ˌō-i-myə-nō-ˈa-ˌsā How to pronounce radioimmunoassay (audio)
: immunoassay of a substance that has been radioactively labeled
radioimmunoassayable adjective

Examples of radioimmunoassay in a Sentence

Recent Examples on the Web The remaining half was awarded to Yalow for the development of radioimmunoassays, which detect substances in the body that exist in very small quantities. Eryn Brown, Washington Post, 23 Feb. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'radioimmunoassay.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1961, in the meaning defined above

Time Traveler
The first known use of radioimmunoassay was in 1961

Dictionary Entries Near radioimmunoassay

Cite this Entry

“Radioimmunoassay.” Dictionary, Merriam-Webster, Accessed 24 Apr. 2024.

Medical Definition


ra·​dio·​im·​mu·​no·​as·​say ˌrād-ē-ō-ˌim-yə-nō-ˈas-ˌā, -im-ˌyü-, -a-ˈsā How to pronounce radioimmunoassay (audio)
: immunoassay of a substance (as insulin) that has been radiolabeled
abbreviation RIA
radioimmunoassayable adjective

More from Merriam-Webster on radioimmunoassay

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