n. A steroid hormone produced mostly during pregnancy
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a naturally occurring estrogenic hormone; a synthetic form is used to treat estrogen deficiency
Word Usage
"The issue flared last year, when the FDA declared that custom-mixed hormones were no safer than traditional treatments and warned pharmacies to stop using estriol, which is not approved in this country for any use."