progesterone

noun

pro·​ges·​ter·​one prō-ˈje-stə-ˌrōn 

: a female steroid sex hormone C₂₁H₃₀O₂ that is secreted by the corpus luteum to prepare the endometrium for implantation and later by the placenta during pregnancy to prevent rejection of the developing embryo or fetus

Examples of progesterone in a Sentence

Recent Examples on the Web

The announcement impacts both systemic and topical estrogen products, plus those containing both progesterone and estrogen. —Helen Carefoot, Flow Space, 10 Nov. 2025

After a few more appointments and additional testing to rule out other potential causes, Hamady was started on oral progesterone and estradiol gel. —Olivia Lee, Charlotte Observer, 10 Nov. 2025

Hormone therapy consists of estrogen and progesterone (or estrogen only for women who do not have a uterus), and is the most effective treatment for menopause, and is the first recommendation, according to the North American Menopause Society. —Laura Trujillo, USA Today, 10 Nov. 2025

Researchers found key reproductive hormones estrogen, progesterone and testosterone in hard tissues, such as the bones and teeth, of skeletons dating back as far as 1,000 years, according to a study published October 2 in the Journal of Archaeological Science. —Jack Guy, CNN Money, 31 Oct. 2025

Word History

Etymology

blend of progestin and luteosterone (borrowed from German Luteosteron, from luteo- luteo- + -steron -sterone), both earlier names for progesterone

Note: The name resulted from a compromise between researchers associated with the earlier names, the American gynecologist Willard M. Allen and embryologist George Washington Corner, and the German biochemists Adolph Butenandt and Karl Heinrich Slotta. See W. M. Allen, A. Butenandt, G. W. Corner, and K. H. Slotta, "Nomenclature of Corpus Luteum Hormone," Nature, vol. 136, number 303 (September 1, 1935), p. 303.

First Known Use

1935, in the meaning defined above

Rhymes for progesterone

• aldosterone
• anticyclone
• testosterone
• acetone
• anglophone
• baritone
• bourguignon
• buspirone
• chaperon
• chaperone
• cobblestone
• collarbone

Kids Definition

progesterone

noun

pro·​ges·​ter·​one prō-ˈjes-tə-ˌrōn 

: a hormone that is produced by the corpus luteum and causes the uterus to change so that it provides a suitable environment for a fertilized egg

Medical Definition

progesterone

noun

pro·​ges·​ter·​one prō-ˈjes-tə-ˌrōn 

: a female steroid sex hormone C₂₁H₃₀O₂ that is secreted by the corpus luteum to prepare the endometrium for implantation and later by the placenta during pregnancy to prevent rejection of the developing embryo or fetus

Note: Synthetic steroids (such as progestins) that function similarly in the body are sometimes also referred to as progesterones.