Acts of Parliament derogatory from the power of
subsequent Parliaments bind not. --Blackstone.
His language was severely censured by some of his
brother peers as derogatory to their other. --Macaulay.
{Derogatory clause in a testament} (Law), a sentence of
secret character inserted by the testator alone, of which
he reserves the knowledge to himself, with a condition
that no will he may make thereafter shall be valid, unless
this clause is inserted word for word; -- a precaution to
guard against later wills extorted by violence, or
obtained by suggestion.