Webster's English Dictionary

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tremble

1. trem.ble \'trem-b*l\ \-b(*-)lin\ \-b(*-)l*r\ vi or trem.bling [ME 
   tremblen, fr. MF trembler, fr. ML tremulare, fr. L tre]mulus tremulous, fr. 
   tremere to tremble; akin to Gk tremein to tremble 1: to shake involuntarily 
   (as with fear or cold) : SHIVER  2: to move, sound, pass, or come to pass 
   as if shaken or tremulous  3: to be affected with fear or doubt  - 
   trem.bler n
2. tremble n 1: a fit or spell of involuntary shaking or quivering  2: a 
   tremor or series of tremors  pl but sing in constr  3: severe poisoning of 
   livestock and esp. cattle by a toxic alcohol present  in a snakeroot and 
   rayless goldenrod