tear


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Related to tear: tear gas, meniscus tear

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 ?
OUR | tears could provide a vital clue to diagnosing dementia, scientists believe.
Israeli forces fired tear gas canisters at Palestinian locals and their homes during clashes that broke out in Husan village, west of the city, causing several to suffocate.
Your GP may refer you to an ophthalmologist (eye surgeon) who will look for blockages in your tear ducts under a local anaesthetic.
Key words: phenol red thread test, tear, ophthalmology, Falconiformes, avian, Falco
To raise awareness and help those struggling with Dry Eye, EyePromise is kicking off the EZ Tears Dry Eye Challenge as well as launching an educational campaign that includes a contest, free prizes, and special learning resources.
If feeding serves only to close the space between separated dendrites, inadequate feeding cannot be the reason for hot tearing; there are open and filled hot tears.
Every time you blink, the tear film gets repainted on the front of your eye," Maki noted.
13] showed that there was a very strong correlation between the slope from EWF tests and measured tear values of various polyethylene (PE) films.
Human rights campaigners exploit the use or abuse of tear gas, by developing countries in particular, as an important campaigning tool to defame incumbent governments.
The t-peel (ASTM D 1876-01) has good tear geometry.
When the problem is a blocked tear duct, removing tears that have collected can help.
Since Bahrain is such a small island, the use of tear gas doesn't just affect the demonstrators it is used to disperse, it also affects those living in the area in which it is used.