1. Acting against or blocking the effects of oestrogen (estrogen) in the body; relating to or denoting a substance that inhibits oestrogen activity.
Usage: Medical/pharmaceutical term; Also spelled 'antiestrogenic' in U.S. English

Examples

• The drug has antioestrogenic properties that help treat certain hormone-sensitive cancers.
• Antioestrogenic compounds are used in breast cancer therapy to reduce tumor growth.
• Researchers studied the antioestrogenic effects of the new medication on patient outcomes.
• The antioestrogenic mechanism of action makes this treatment suitable for postmenopausal women.
• Some antioestrogenic agents are prescribed to prevent recurrence of estrogen-dependent tumors.