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1. A tight closure.
2. To effect a tight closure.


Heart surgery A clinical trial–Simple & Effective Arterial Closure Study which evaluated the safety and efficacy of the Duett vascular sealing device


Public health Any air- and/or water-tight closure on a product–blood components, medications intended to maintain a product sterilely until used by a consumer; products with broken seals should be discarded

staining, fluorescein 

The artificial coloration of tissue by fluorescein. Under ultraviolet illumination, it stains dead or degenerated corneal epithelial cells due to abrasions, old age or following inadequate contact lens fit, a yellowish-green colour. It also stains the tears, thus facilitating the evaluation of tear drainage or the blood flow through the retina and choroid when injected intravenously. Corneal staining resulting from contact lens wear may present in various shapes, locations, depths or severity. A very common form is punctate staining as appears in punctate epithelial keratitis. There may be arcuate stains located in different parts of the cornea, some inferiorly (called inferior epithelial arcuate lesions) or superiorly (called superior epithelial arcuate lesions, acronym: SEAL, or epithelial splitting), which usually do not give rise to symptoms and appear mainly with soft or silicone hydrogel lenses. A very severe form of staining is called epithelial plug. It is typically round in shape and represents a loss of the full thickness of the epithelium. Corneal staining resulting from contact lens wear typically disappears after cessation of contact lens wear. See fluorescein angiography; dye dilution test; fluorescein test.


1. Tight closure.
2. To effect a tight closure.

Patient discussion about seal


A. honey has an antimicrobial activity due to it's acidity, osmotic power and hydrogen peroxide. about MRSA - there is a New Zealandic research about a type of honey that is effective against infections of MRSA. but it's only one research and another investigation is required.

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References in periodicals archive ?
However, seals (especially double seals) can cause substantial friction losses in smaller, high-pressure pumps.
The visitors had won their previous two games but an Anton Thomas double sealed Thurnby's victory.
The company's cone valve is double sealed to prevent tipping or leaking during transport and can be easily secured for tumble blending.
Design features include stainless steel hardware and shaft extension, moisture-resistant wire, potted windings for additional protection, improved heat transfer, double sealed bearings, seals and O-rings.
Housings are of gear-quality cast iron, and the high-speed and low-speed shafts can be double sealed for severe applications.
Every container of asbestos that is removed is double sealed, then clearly labeled with the building owner's name, before being carted off for appropriate disposal.
Kelty remain top after stuart Cargill's double sealed a 2-1 win at rivals Hill of Beath.
Carlos Bocanegra's own goal gave RANGERS a scare at ST JOHNSTONE before Nikica Jelavic's double sealed a vital 2-1 away win.
An Anthony Weaver double sealed Aston Park Rangers a 2-0 success at Llanystumdwy, while Dylan Thomas' early pair helped Pwllheli see off Llanberis 3-1.
Goals from Matt Taylor, Gareth Andrew, Will Pearce and a Richard Lane double sealed victory.
ALI GERBA'S double sealed an impressive victory for MK Dons.
The nose wheel bearings are maintenance free and double sealed for long life.