[trem-er, tree-mer]
involuntary shaking of the body or limbs, as from disease, fear, weakness, or excitement; a fit of trembling.
any tremulous or vibratory movement; vibration: tremors following an earthquake.
a trembling or quivering effect, as of light.
a quavering sound, as of the voice.

1325–75; Middle English < Latin: a trembling, equivalent to trem(ere) to tremble + -or -or1

tremorous, adjective

1. shudder, shiver, quiver. 3. oscillation. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tremor (ˈtrɛmə)
1.  an involuntary shudder or vibration, as from illness, fear, shock, etc
2.  any trembling or quivering movement
3.  a vibrating or trembling effect, as of sound or light
4.  Also called: earth tremor a minor earthquake
5.  (intr) to tremble
[C14: from Latin: a shaking, from tremere to tremble, quake]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "terror," from O.Fr. tremor "fear, terror" (13c.), from L. tremorem (nom. tremor) "a trembling, terror," from tremere (see tremble). Sense of "an involuntary shaking" first recorded 1615 and probably represents a re-introduction from Latin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tremor trem·or (trěm'ər)

  1. An involuntary trembling movement.

  2. Minute ocular movement occurring during fixation on an object.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
tremor   (trěm'ər)  Pronunciation Key 
  1. A relatively minor seismic shaking or vibrating movement. Tremors often precede larger earthquakes or volcanic eruptions.

  2. An involuntary shaking or trembling of the head or extremities that can be idiopathic or associated with any of various medical conditions, such as Parkinson's disease.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And if traditional academe fears these tremors, perhaps that is also a good
Until now, spiders were thought to be the only animals to detect tremors in
  their webs caused by foreign objects.
With each new incident of record monsoon floods, fires and earthquakes, more
  tremors shake the global economy.
Other eyewitnesses described tremors that damaged homes and powerful, hot winds
  that literally knocked people out of their chairs.
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