Word History

First Known Use

1998, in the meaning defined above

Time Traveler
The first known use of RNAi was in 1998

Browse Nearby Words

Cite this Entry

“RNAi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/RNAi. Accessed 10 Sep. 2025.

Medical Definition

RNAi

noun
ˌär-ˌen-ˌā-ˈī
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!