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Meaning of antigestational drug

an•tiges•ta'tion•al drug"

Pronunciation: (an"tē-jes-tā'shu-nl, an"tī-), [key]
  1. a drug that averts a pregnancy by preventing the fertilized egg from becoming implanted in the uterine wall.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.