(biology) Estrus.

(biochemistry, steroids) Any of a group of steroids that are secreted by the ovaries and function as female sex hormones.

(American spelling, biochemistry, steroids, pharmacology) A natural estrogenic hormone that is a ketone C₁₈H₂₂O₂ found in the body chiefly as a metabolite of and less potent than estradiol, that is also secreted especially by the ovaries, and that is used to treat various conditions (such as ovarian failure and menopausal symptoms) relating to estrogen deficiency.

(biochemistry) Of, relating to, or acting like estrogen. / (medicine) Causing estrus.

plural of estrogen

Of, pertaining to, or in a state of estrus.

(medicine) Any condition caused by the ingestion of estrogen

plural of estrone

The condition of being estrogenic.

The (normal) presence of estrogens in the blood