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 ?
And if you find you have a rotator cuff tear, ask to see a specialist surgeon to have it repaired.
We found that the constant and unpredictable use of tear gas in Palestine refugee camps has a devastating effect on the mental and physical health of residents," said the report's co-author, Dr Rohini Haar, a researcher at the UC Berkeley centre and a doctor with Physicians for Human Rights.
On MRI, the most common site medial meniscal tear was the posterior horn seen in 17 cases (54.
GLANDS in the eyelids make an oil that slows the evaporation of tears between blinks.
Objective: The present study aimed to determine the prevalence of cemental tears and evaluate its relation with patient gender, age and tooth type in a population of adult dental patients applied to the university hospital in the center Black Sea Region of Turkey.
Published in 2007, the Dry Eye Workshop (DEWS) describes dry eye as "a multi-factorial disease of the tears and ocular surface which results in symptoms of discomfort, visual disturbance and tear film instability, with potential damage to the ocular surface.
Fifty-five of the 74 ultrasound examinations correctly identified the presence (partial tear or full thickness tear) or absence of a tear, resulting in an accuracy of detecting pathology (tear versus no tear) of 74%.
If the tear is in the bicep region, a procedure called an open subpectoral bicep tenodesis can be performed.
A cadaveric study reported that this type of tear was the most frequent (55%) among all of the partial-thickness tears.
It may be nit-picking to fuss over tear staining, but she is so close to perfect, I'd like that to be, too.
10) The tear secretions are drained from the orbit by 2 lacrimal caniculi, situated close to the nasal commissure of the eyelids, which then open via the nasolacrimal duct into the lower portion of the nasal cavity, such that secretions eventually drain into the mouth.
Murray says he considers arthroscopic surgery only if non-operative treatments have failed to provide sufficient improvement and patients can clearly differentiate new symptoms of the meniscal tear from those of their knee OA.