• Any natural or laboratory-made substance that has some or all of the biologic effects of progesterone, a female hormone.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• Any synthetic steroid hormone that resembles the naturally occurring hormone and has progesterone-like properties.
  NCI
  U.S. National Cancer Institute, 2021
• Class of drugs which mimic progesterone by promoting gestation.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Compounds that interact with PROGESTERONE RECEPTORS in target tissues to bring about the effects similar to those of PROGESTERONE. Primary actions of progestins, including natural and synthetic steroids, are on the UTERUS and the MAMMARY GLAND in preparation for and in maintenance of PREGNANCY.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• (progestogen) Substances that produce effects similar to those of progesterone, the only natural progestogen. All other progestogens are synthetic and are often referred to as progestins. All progestogens have antiestrogenic and antigonadotropic properties.
  NCI
  U.S. National Cancer Institute, 2021