Kalmar "oestrone" (wanda kuma aka rubuta "estrone" a cikin Ingilishi na Amurka) yana nufin wani nau'in hormone estrogen wanda aka samar a cikin jiki, da farko a cikin ovaries, glandan adrenal, da kuma kitse. Yana da hormone steroid wanda ke taka muhimmiyar rawa wajen daidaita tsarin haihuwa na mace kuma yana da hannu a cikin metabolism na kashi, metabolism na lipid, da lafiyar zuciya. A wuraren kiwon lafiya, a wasu lokuta ana amfani da Oestrone azaman magani don magance wasu yanayi, kamar alamun bayyanar al'ada ko wasu nau'in ciwon daji na nono.