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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.


n 1. something that firmly closes or secures.
2. a tight and perfect closure.
v 3. to keep shut, enclosed, or confined.
seal, border,
seal, double,
n a seal consisting of gutta-percha underneath another material such as temporary cement; used to close the coronal opening in a tooth during endodontic treatment.
seal, hermetic,
n perfect and absolute obliteration of all space within a tooth.
seal, peripheral,
seal, posterior palatal,
n the seal at the posterior border of a denture produced by displacing some of the soft tissue covering the palate by extra pressure developed in the impression or by scraping a groove along the posterior seal area in the cast on which the denture is to be processed.
seal, postpalatal,
n See seal, posterior palatal.


1. a marine mammal; member of the suborder Pinnipedia. There are two major groups, the earless seals (family Phocidae) including many species, and the eared seals (family Otariidae) including sealions and fur seals. They are carnivorous and have four paddles which enable them to move on land and to swim.
2. a very dark brown coat color of cats, seen in brown (or sable) Burmese and on the extremities of seal-point Siamese and Colorpoint cats.

seal pox
see sealpox.

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.

More discussions about seal
References in periodicals archive ?
He added that the Bab al-Sharji (Tahrir square area sealed off and also Saadoun and Abu Nawas Streets, with closing the bridges of Republic (Jumuriah) and Sinak.
Normally open to the public, the area was immediately sealed off.
They discovered the body of a 62-year-old man, and the station and surrounding roads were immediately sealed off, with all trains running straight through without stopping.
30am on Friday, adding: "The scene has been sealed off as an investigation begins.
Police attended the scene, sealed off the area and the item was removed for disposal by Army experts who have confirmed that it was not live, and was a training grenade.
POLICE sealed off a Central Middlesbrough street after the discovery of a man's body.
Parts of Coventry city centre were sealed off after an old Second World War shell was found on a building site.
The Dana railway bridge near HMP Shrewsbury was sealed off with police tape yesterday and nearby Castle Walk was closed to traffic as detectives searched the scene.
About 20 offices were sealed off and staff moved to alternative accommodation to minimise disruption to services.
The ecstasis they evoke is contained, distanced, almost sealed off as an object of memory and melancholic contemplation by the constraint of the easel-painting conventions through which the work is presented--but not without a struggle.
Officers have sealed off an underpass on Moorend Avenue, near Meriden Park, as they launch an investigation into the assault on a 14-year-old girl.
One said: "There were loads of police and it was sealed off as a crime scene.