The Collaborative International Dictionary of English v.0.48:

Clamorous \Clam"or*ous\, a. [LL. clamorosus, for L. Clamosus:
   cf. OF. clamoreux.]
   Speaking and repeating loud words; full of clamor; calling or
   demanding loudly or urgently; vociferous; noisy; bawling;
   loud; turbulent. "My young ones were clamorous for a
   morning's excursion." --Southey. -- Clam"or*ous*ly, adv. --
   Clam"or*ous*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

clamorously
    adv 1: in manner that attracts attention; "obstreperously, he
           demanded to get service" [syn: obstreperously,
           loudly, clamorously]