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Meaning of morning-after pill

morn'ing-af'ter pill"

Pronunciation: (môr'ning-af'tur, -äf'-), [key]
— Pharm. Pharm.
  1. a contraceptive pill containing only an estrogen and used by women within a few hours after sexual intercourse.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.