\De*rog"a*to*ry\, a.
Tending to derogate, or lessen in value; expressing
derogation; detracting; injurious; -- with from to, or unto.
      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.