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Related to tremor: essential tremor


a minor earthquake
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an involuntary trembling of the entire body or parts of it. Tremors are characteristically rhythmic and stereotypic; usually they have a narrow range, most often affecting the fingers, eyelids, tongue, lower jaw, and head. In healthy subjects, tremors may be caused by muscular strain, emotional excitement, or exposure to cold. Pathological tremors may be symptoms of chronic alcoholism, thyrotoxicosis, neurotic states, acute infections, and such diseases as parkinsonism. The symptom is treated by treating the primary disease.

Eye tremor is an involuntary rapid movement of the eyeball in relation to the optic axis; its frequency is from 20 to 150 Hz, and its amplitude, from 5 to 15 seconds of arc. Visual perception itself depends to a significant degree on eye tremor, which produces constant changes in the illuminance of certain photoreceptors—that is, the photoreceptors located at the variously illuminated points of the retinal periphery. An image whose projection on the retina remains completely stable for more than a few seconds ceases to be perceived by the visual centers of the brain.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A minor earthquake. Also known as earthquake tremor; earth tremor.
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Tremor said it plans to use the cash infusion to fuel further development of its "programmatic insurance and reinsurance risk transfer marketplace," with additions planned including enhanced quoting and management capabilities.
The tremor comes only two days after a 2.1 scale "micro seismic event" was detected at the Cuadrilla energy site late on Saturday evening, previously the largest tremor ever recorded at the site.
According to the British Geological Survey, this is the third tremor at the Preston New Road site in a week after a 1.55-magnitude tremor was recorded last Wednesday.
However all work on the site had been suspended following Saturday's tremor to allow for an investigation by the Oil and Gas Authority.
Fracking was temporarily stopped at the Cuadrilla site after other tremors on Wednesday including one that measured 1.55 on the Richter scale, the largest ever at the site.
Social media users in Kenya reported feeling the tremor. "Did I feel myself swing side by side in the office?
The method utilises the accelerometer in a smartphone to measure the tremor. The new invention allows researchers to measure how various medications affect tremors, in a much more affordable and expedient way.
Two earthquakes shook Itbayat, Batanes on Saturday as the country's northernmost municipality still reels from devastating tremors that left nine people dead late last month.
When to see your GP See your GP if the tremor is getting worse over time or it's affecting your daily activities.
This would allow those who have essential tremor to undergo a non-invasive and less risky form of treatment.
The earth tremor was felt by the inhabitants, the same source specified in a statement to TAP correspondent in the region, pointing out that according to the preliminary analyses the epicentre of the tremor had been located at 39.38 degrees latitude and 8.95 longitude in north-west of Amdoun.
- US-based clinical stage biotechnology company Cavion, Inc will present the results of the Phase 2 study of its lead compound, CX-8998, for essential tremor in a platform presentation during the American Academy of Neurology 71st annual meeting, May 4 to May 10, 2019 in Philadelphia, PA, the company said.