progesterone


pro·ges·ter·one

noun \prō-ˈjes-tə-ˌrōn\

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

Full 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

Origin of PROGESTERONE

progestin + -sterone
First Known Use: 1935

pro·ges·ter·one

noun \prō-ˈjes-tə-ˌrōn\   (Medical Dictionary)

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

progesterone

noun    (Concise Encyclopedia)

Steroid hormone secreted by the female reproductive system that functions mainly to regulate the condition of the endometrium (see uterus), preparing it to accept a fertilized egg. If the egg is not fertilized, the level of progesterone drops, the uterine lining breaks down, and menstruation ensues. If the egg is fertilized (see pregnancy), the placenta produces progesterone, whose effects include preparing the mammary glands for lactation. Many forms of oral contraception use a synthetic progesterone.

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