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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 It might be outdated or ideologically biased.



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, 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 ?
For safety, they split and tear away when punctured--alerting the wearer of the potential for contamination.
That force alone would tear away anything not attached to Earth's bedrock (solid rock beneath the soil) like buildings, cars, and the rest of us.
High on the list are the intense radiation and high-speed winds emanating from Orion's collection of massive stars, which tear away material that the young star's gravity cannot hold.
If developers are permitted to "tear away" pieces of landmarks, Wallerstein said, the landmark laws cease to protect the important architectural and historical sites in the city.
Luke Tittensor, who plays tear away Daz Eden in Emmerdale, is said to have broken another man's jaw during an alleged assault.
The young tear away, drunk on vodka and boasting he was part of the London Park Gang terrorizing Mirfield, punched 22-year-old Ross Wood, who was out with friends.
Not only must they find the mysterious couple to whom she was last seen giving directions, but they must also locate diabetic Kelly Stevens (Eleanor Gecks), a teen tear away who has disappeared following an argument at home.