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see spasmspasm,
involuntary rigid muscle contraction, often persistent and often accompanied by pain. It usually has some underlying physical cause such as disease, strain, or injury to the muscle or nearby tissues, impairment of circulation, or a disturbance of body chemistry.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an involuntary muscular contraction; a form of hyperkinesia. A tic may be related to the effect of encephalitis on parts of the brain; it may be a congenital pathological condition, frequently associated with a neuropathic personality; it may appear with attacks of trigeminal neuralgia (tic douloureux); or it may result from neuritis of the facial nerve. A distinction is made between generalized tics, involving all the muscles, and local tics, which are more common. The muscles usually affected are those of the face and neck. The twitching resembles such voluntary movements as winking, frowning, lip-smacking, or lip-licking. Tics generally disappear during sleep and become more severe under emotional stress. Treatment consists of the administration of sedatives, tranquilizers, and anticonvulsants.

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


spasmodic twitching of a particular group of muscles
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(Token Ring Interface Card) Slang for a Token Ring NIC (network interface card). See token ring network.
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References in periodicals archive ?
A history of anxiety disorders, pronounced tics during the initial exam, and having three or more vocal tics -- such as throat clearing or making other noises -- indicated a likelihood of tics at the one-year follow-up.
The University of Wisconsin Health System has more on tics.
Neurotrophic factors act as reciprocal mediators between the neurons and the immune system cells to provide modulation of the immune system.4 There is evidence that immunoreactivity plays a role in the etiopathogenesis of autism spectrum disorder, chronic schizophrenia, and major depressive disorder.5-7 Because tic disorders are associated with neurodevelopmental origin, changes in dopaminergic neurons, and the formation of immunoreactivity, it is thought that neurotrophic factors may be crucial in the emergence of tic disorders.
GDNF is another important neuropeptide for the development of dopaminergic and noradrenergic systems.8 In this study, we aimed to investigate the role of neurotrophic factors in the etiopathogenesis of Tic disorder.
Varios son los motivos por los que las TIC pueden no estar utilizandose en las aulas con alumnado, con o sin discapacidad intelectual.
Figure 8 shows the indentation of sample 10 which was produced with 100% of Al, 8% of SiC, and 8% of TiC. It is evident from these figures that the hardness of the composite material was much higher than that of the pure metal.