aromatase inhibitor

noun

: any of a class of drugs (as anastrozole or exemestane) that suppress the synthesis of estrogen in the body by inhibiting the action of aromatase and are used to treat breast cancer in postmenopausal women

Aromatase inhibitors, like tamoxifen, are directed at the hormone estrogen, which is known to stimulate tumor growth in most breast cancer patients.

—Laurie Tarkan, The New York Times

Chemoprevention with aromatase inhibitors might be particularly suitable for women with relatively high plasma estrogen levels.

—Ian E. Smith and Mitch Dowsett, The New England Journal of Medicine