Etymology
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tremor (n.)

late 14c., "terror," from Old French tremor "fear, terror, quaking" (13c.), from Latin tremorem (nominative tremor) "a trembling, terror," from tremere (see tremble (v.)). Sense of "an involuntary shaking" first recorded 1610s and probably represents a re-introduction from Latin.

updated on February 16, 2014

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Definitions of tremor from WordNet
1
tremor (n.)
an involuntary vibration (as if from illness or fear);
Synonyms: shudder
tremor (n.)
a small earthquake;
Synonyms: earth tremor / microseism
tremor (n.)
shaking or trembling (usually resulting from weakness or stress or disease);
2
tremor (v.)
shake with seismic vibrations;
Synonyms: quake
From wordnet.princeton.edu, not affiliated with etymonline.