morning-after pill

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a large dose of estrogen taken orally within 24 to 72 hours after intercourse;
prevents implantation of a fertilized ovum and so acts as a contraceptive;
commonly used after rape or incest
• Hypernyms:
contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control device