definition of
tremor

[1] #1 tremor n. [shudder] an involuntary vibration (as if from illness or fear). wn

[2] #2 tremor n. [earth tremor, microseism] a small earthquake. wn

[3] #3 tremor v. [quake] shake with seismic vibrations; "The earth was quaking". wn

[4] #4 tremor n. shaking or trembling (usually resulting from weakness or stress or disease). wn