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
"In 1932, Butenandt was able, from observations made in spectral analysis, and especially on the basis of the then established correct formula of cholesterol to draw up the formulae of the chemical structure of oestrone and oestriol."