The Collaborative International Dictionary of English v.0.48:

Clamor \Clam"or\, v. i.
   To utter loud sounds or outcries; to vociferate; to talk in a
   loud voice; to complain; to make importunate demands.

   Syn: clamor, roar, vociferate, holler, hollo.
        [1913 Webster + WordNet 1.5]

              The obscure bird
              Clamored the livelong night.        --Shak.
        [1913 Webster]

   2. to dispute in a loud voice.

   Syn: brawl, wrangle, clamor.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Clamor \Clam"or\, n. [OF. clamour, clamur, F. clameur, fr. L.
   clamor, fr. clamare to cry out. See Claim.]
   1. A great outcry or vociferation; loud and continued
      shouting or exclamation from many people. --Shak. [Also
      spelled clamour.]

   Syn: clamor, hue and cry.
        [1913 Webster + WordNet 1.5]

   2. Any loud and continued noise. --Addison.
      [1913 Webster]

   3. A continued expression of dissatisfaction or discontent; a
      popular outcry. --Macaulay.

   Syn: Outcry; exclamation; noise; uproar.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clamor \Clam"or\, v. t. [imp. & p. p. Clamored; p. pr. & vb.
   n. Clamoring.]
   1. To salute loudly. [R.]
      [1913 Webster]

            The people with a shout
            Rifted the air, clamoring their god with praise.
                                                  --Milton
      .
      [1913 Webster]

   2. To stun with noise. [R.] --Bacon.
      [1913 Webster]

   3. To utter loudly or repeatedly; to shout.
      [1913 Webster]

            Clamored their piteous prayer incessantly.
                                                  --Longfellow.
      [1913 Webster]

            To clamor bells, to repeat the strokes quickly so as
            to produce a loud clang.              --Bp.
                                                  Warbur?ion.
      [1913 Webster]

WordNet (r) 3.0 (2006):

clamor
    n 1: a loud harsh or strident noise [syn: blare, blaring,
         cacophony, clamor, din]
    2: loud and persistent outcry from many people; "he ignored the
       clamor of the crowd" [syn: clamor, clamoring, clamour,
       clamouring, hue and cry]
    v 1: make loud demands; "he clamored for justice and tolerance"
         [syn: clamor, clamour]
    2: utter or proclaim insistently and noisily; "The delegates
       clamored their disappointment" [syn: clamor, clamour]
    3: compel someone to do something by insistent clamoring; "They
       clamored the mayor into building a new park"