or chiefly Brit  an*ti*oes*tro*gen  n :  a substance that inhibits the physiological action of an estrogen an*ti*es*tro*gen*ic or chiefly Brit  an*ti*oes*tro*gen*ic  adj 
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.