Word History

Etymology

Roussel-UCLAF, the drug's French manufacturer + 486, laboratory serial number

First Known Use

1982, in the meaning defined above

Time Traveler
The first known use of RU-486 was in 1982

Dictionary Entries Near RU-486

Cite this Entry

“RU-486.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/RU-486. Accessed 2 Dec. 2022.

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