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a drop of the secretion of the lacrimal glands



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.


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
References in periodicals archive ?
THIEVES tore away guards protecting the windows of Leamington's parish church, causing up to pounds 40,000 of damage.
When surfer Bethany Hamilton hit the waves off Hawaii last October, a shark lunged out of the water, bit the 13-year-old, and tore away her left arm and a chunk of her surfboard.
The station filmed the Super Bowl show where Timberlake tore away a leather cup to reveal her right breast in front of 100million viewers.
Northampton applied pressure in the closing stages with substitute Steve Morison wasting their best chance, but they were caught on the break at the death when Andrews tore away to wrap up the points.
Hurricane Isidore roared into the Yucatan Peninsula, killing at least two people and leaving hundreds of thousands without power today as howling winds ripped up trees, tore away rooftops and blocked roads.