poison pill poison pea • poisonproof · · · Info · Definitions · Characters · · poison pill · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) the target company defends itself by making its stock less attractive to an acquirer. Synonyms: poison pill. · · Noun Definition 1 Characters · · space U+0020 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 s latin small letter s U+0073