derogatory clause

Noun

 * 1)  A secret clause inserted into a testament and known by the testator alone, with a condition that no will made thereafter will be valid unless the same clause is inserted word for word (to guard against later wills extorted by violence, etc).

Translations

 * Finnish: derogatorinen ehto, derogatorinen klausuuli
 * German: derogatorische Klausel
 * Polish: klauzula derogacyjna