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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 ?
Encountering prey, army ants quickly swarm over their victim, tearing away flesh with their sharp mandibles.
Madsen seems to have done it in two weeks by diving to the floor for loose balls, tearing away rebounds in traffic and racing full speed from one end of the court to the other in transition.
The Bill Turner-trained Huxleen dumped Glasgow jockey Derek McGaffin at the start before tearing away from the stalls.