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

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.
   [1913 Webster]

         He fell into an universal tremor of all his joints.
                                                  --Harvey.
   [1913 Webster] Tremulant