Webster's English Dictionary

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tremor

trem.or \'trem-*r\ n [ME tremour, fr. MF, fr. L tremor, fr. tremere] 1: a 
   trembling or shaking usu. from weakness or disease  2: a quivering or 
   vibratory motion  3a: a feeling of uncertainty or insecurity  3b: a cause 
   of such a feeling