noun Pathology.

1935–40; < Greek *brȳx(is) a gnashing of teeth (brȳ́k(ein) to gnash, bite + -sis -sis) + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bruxism (ˈbrʌksɪzəm)
the habit of grinding the teeth, esp unconsciously
[irregularly formed from Greek brykein to gnash the teeth + -ism]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"grinding the teeth unconsciously," from Gk. ebryxa, aorist root of brykein "to gnash the teeth."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

bruxism brux·ism (brŭk'sĭz'əm)
The habitual involuntary grinding or clenching of the teeth, usually during sleep, as from anger, tension, fear, or frustration.

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
bruxism   (brŭk'sĭz'əm)  Pronunciation Key 
The habitual, involuntary grinding or clenching of the teeth, usually during sleep and sometimes associated wth stress.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The cause of bruxism is not completely agreed upon, but daily stress may be the trigger in many people.
It's called sleep bruxism, and it refers to the grinding or clenching of teeth.
Many explanations have been offered for why night bruxism occurs and who is at risk, without conclusive proof.
A-The medical name for grinding, gnashing or clenching teeth tightly during sleep is bruxism.
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