tear


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Related to tear: tear gas, meniscus tear

tear

a drop of the secretion of the lacrimal glands
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 It might be outdated or ideologically biased.

Tear

 

a drop of the clear, slightly opalescent fluid secreted by the lacrimal glands. Tears are slightly alkaline. They contain as much as 99 percent water and 0.9 percent inorganic matter, chiefly sodium chloride and small quantities of sodium carbonate, magnesium carbonate, calcium sulfate, and calcium phosphate, as well as the antibacterial enzyme lysozyme; other proteins constitute 0.1 percent. Tears moisten the anterior surface of the eye and prevent it from drying, wash foreign bodies out of the conjunctival sac, and participate in the nutrition of the cornea.

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

run

run, 3
1. In roofing, the horizontal distance from the face of a wall to the ridge of the roof.
2. In stairways, the width of a single stair tread.
3. The horizontal distance covered by a flight of steps.
4. The runway or track for a sash.
5. A small stream of paint flowing vertically on a
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
A rotator cuff tear is described as either a partial or full thickness tear based on its severity.
There was no threat to the soldiers or anyone else at the time, yet the soldiers continued to fire tear gas into the neighbourhood even though the streets were completely empty of people.
With this model, we found that the probability of a medial meniscal tear occurring increases with increasing age regardless of patient sex, although men were more likely to have a medial meniscal tear than women.
Best Cinematography: Sasha Palomares (Never Tear Us Apart)
In the population we studied, the partial thickness rotator cuff tear prevalence was 7.69% in 20-30 years population and 14.28% in 31-40 years population.
Even with normal tears, your veterinarian may still diagnose him with KCS if the rest of the eye exam is consistent with a poorly functioning tear film.
Because of the high frequency of rotator cuff tear after shoulder dislocation in patients aged over 40, they should have either urgent ultrasound scanning or MRI.
A thick tendon likely represents tendon edema as a result of the tear; however, additional inflammatory changes cannot be excluded.
WATERING eyes occur if too many tears are produced or if they cannot drain away properly.
Tear film contains three layers--oil, water, and mucous.
The purpose of this study was to investigate rotator cuff tear characteristics and clinical outcomes after rotator cuff repair and provide the pathomechanism of rotator cuff tears in young overhead sports athletes.