Small shaking or vibrating movements, especially those caused by earthquakes, or involuntary shaking of the body.
From Latin 'tremere,' meaning 'to shake' or 'to tremble.' The word entered English through Old French and has been used since medieval times to describe both literal shaking and emotional fear.
Earthquake tremors are actually useful to scientists because they travel through the Earth and reveal what's inside the planet—seismographs can detect tremors from earthquakes happening on the opposite side of the world! Some people can develop hand tremors from certain diseases or as a side effect of medicine.
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