cyproterone

noun

cy·​prot·​er·​one sī-ˈprä-tə-ˌrōn How to pronounce cyproterone (audio)
: a synthetic steroid C22H27ClO3 that inhibits the action and secretion of testosterone by blocking the activity of androgen receptors

Word History

Etymology

probably from cycl- + progesterone

First Known Use

1966, in the meaning defined above

Time Traveler
The first known use of cyproterone was in 1966

Rhymes for cyproterone

See All Rhymes for cyproterone

Browse Nearby Words

Cyprolithic
cyproterone
Cyprus
See all Nearby Words

Cite this Entry

“Cyproterone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cyproterone. Accessed 31 Jul. 2026.

Copy Citation

Medical Definition

cyproterone

noun
cy·​prot·​er·​one sī-ˈprät-ə-ˌrōn How to pronounce cyproterone (audio)
: a synthetic steroid used in the form of its acetate C24H29ClO4 to inhibit the action and secretion of testosterone by blocking the activity of androgen receptors

More from Merriam-Webster on cyproterone

Britannica.com: Encyclopedia article about cyproterone

Love words? Need even more definitions?

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

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of comely

See Definitions and Examples »

Popular in Grammar & Usage

See More

7 Pairs of Commonly Confused Words

Merriam-Webster’s Great Big List of Words You Love to Hate

Is it 'nerve-racking' or 'nerve-wracking'?

Why does English have so many silent letters?

Your vs. You're: How to Use Them Correctly
See More

Popular in Wordplay

See More

Dutch Treat and French Leave: Eight Place-Based Compounds

14 Phobias You Probably Haven't Heard Of

The Longest Long Words List

The Words of the Week - Jul. 31

Even More Bird Names that Sound Like Insults (and Sometimes Are)
See More

Popular

See More

7 Pairs of Commonly Confused Words

Dutch Treat and French Leave: Eight Place-Based Compounds

14 Phobias You Probably Haven't Heard Of
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
chain-question-mark
Missing Link Quiz July 2026 Five seconds to figure out the word that fits bot...
See All