morning after pill

A high-dose oestrogen pill given in the early post-ovulatory period to prevent implantation of a potentially fertilised egg after unprotected intercourse

morn·ing af·ter pill

(mōr'ning af'tĕr pil)

An oral medication, consisting of two pills taken 12 hours apart that, when taken by a woman within 2-3 days after intercourse, reduces the probability that she will become pregnant.
Synonym(s): emergency contraceptive, emergency hormonal contraception, postcoital contraception.