Source : Webster's Revised Unabridged Dictionary (1913)

Tremor \Tre"mor\, n. [L., from tremere to tremble. See
   {Tremble}, v.]
   A trembling; a shivering or shaking; a quivering or vibratory
   motion; as, the tremor of a person who is weak, infirm, or
   old.

         He fell into an universal tremor of all his joints.
                                                  --Harvey.

Source : WordNet®

tremor
     n 1: an involuntary vibration (as if from illness or fear) [syn:
          {shudder}]
     2: a small earthquake [syn: {earth tremor}, {microseism}]
     3: shaking or trembling (usually resulting from weakness or
        stress or disease)
     v : shake with seismic vibrations; "The earth was quaking" [syn:
          {quake}]