tear

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tear

a drop of the secretion of the lacrimal glands

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.

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
References in periodicals archive ?
From the Republic convention of 1860 to the dismal conditions of the Confederate POWs in Camp Douglas on the South Side of Chicago, readers are provided with a vividly accurate historical account of Chicago's conditions during the bloody conflict that threatened to tear apart the American nation.
Hungry human ancestors living in southern Africa at least a million years ago had a simple approach to putting more protein and fat in their diet: They used sharpened pieces of bone to tear apart termite mounds so that they could gulp down mouthfuls of the edible insects.