/ Dictionary / Index A antigestational drug: Meaning and Definition of Find definitions for: an•tiges•ta'tion•al drug" Pronunciation: (an"tē-jes-tā'shu-nl, an"tī-), [key] 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. antigenic determinant antiglobulin Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language