The Collaborative International Dictionary of English v.0.48:

Vociferous \Vo*cif"er*ous\, a. [Cf. F. vocif[`e]re.]
   Making a loud outcry; clamorous; noisy; as, vociferous
   heralds. -- Vo*cif"er*ous*ly, adv. -- Vo*cif"er*ous*ness,
   n.
   [1913 Webster]