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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 It might be outdated or ideologically biased.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 ?
You can either use scissors to cut away excess or carefully tear around each leaf to remove extra tissue paper.
Licenced V8 cars tear around real-life tracks such as Monza and Imola, in a game featuring polished graphics and a smooth framerate.
IT'S time to pretend your name is Bill, wear a hard-hat and tear around in a forklift truck.
They will wear these specially designed 08 saddle cloths as they tear around the hallowed Grand National turf.
As the first machine of the year fell victim to the crusher, the message went out to youngsters who tear around estates and on public footpaths in Tamworth and Lichfield.
The BBC allows a bunch of overgrown schoolboys to tear around nearly killing themselves in very fast cars.