progesterone

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noun pro·ges·ter·one \prō-ˈjes-tə-ˌrōn\

Definition of progesterone

: 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; also : a synthetic steroid resembling progesterone in action

See progesterone defined for English-language learners

Recent Examples of progesterone from the Web

The ovaries slow down their output of estrogen, progesterone, and androgens.

— dr. andrew weil, WIRED, "Help for Hot Flashes? Connect Mind and Body", 13 Feb. 1997

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'progesterone'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of progesterone

progestin + -sterone

First Known Use: 1935

PROGESTERONE Defined for English Language Learners

progesterone

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noun

Definition of progesterone for English Language Learners

medical : a substance (called a hormone) that occurs naturally in women and female animals

Medical Dictionary

progesterone

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noun pro·ges·ter·one \prō-ˈjes-tə-ˌrōn\

Medical Definition of progesterone

: 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; also : a synthetic steroid resembling progesterone in action