Portal Definition–noun | 1. | a door, gate, or entrance, esp. one of imposing appearance, as to a palace. |
| 2. | an iron or steel bent for bracing a framed structure, having curved braces between the vertical members and a horizontal member at the top. |
| 3. | an entrance to a tunnel or mine. |
| 4. | Computers. a Web site that functions as an entry point to the Internet, as by providing useful content and linking to various sites and features on the World Wide Web. |
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From Dictionary
Related topics from Britannicaportal vein
large vein through which oxygen-depleted blood from the stomach, the intestines, the spleen, the gallbladder, and the pancreas flows to the liver. The principal tributaries to the portal vein are ...
Fort Portal
town, western Uganda, situated at an elevation of about 5,000 feet (1,500 metres) and overlooking the mountains of the Ruwenzori Range and the Mufumbiro volcanoes. Roads link it with Rubona, ...
Portal (of Hungerford), Charles Frederick Algernon Portal, 1st Viscount
British air marshal and chief of the British Air Staff during World War II.human cardiovascular system
The portal system may be described as a specialized portion of the systemic circulatory system. Although it originates in capillaries, the portal system is unique from other vessels in that it also ...
digestive system disease
Portal hypertension is the increased pressure in the portal vein and its tributaries. It is the result of impediments to venous flow into the liver, and is brought about by the scarring ...
poison
Toxic responses are also classified according to the site at which the response is produced. The site of toxic response can be local (at the site of first contact or portal of entry of the chemical) ...
sinusoid
irregular tubular space for the passage of blood, taking the place of capillaries and venules in the liver, spleen, and bone marrow. The sinusoids form from branches of the portal vein in the liver ...
Central Asian arts
The art of the Seljuqs, who founded kingdoms in Persia, eastern Byzantium, Syria, and Iraq, eclipsed that of the Samanids, Ghurids, and Ghaznavids. They were great architectural patrons and ...
Bastam
small historic town, northern Iran. It lies just south of the Elburz Mountains in a well-watered plain. Clustered around the tomb of the poet and mystic Abu Yazid al-Bistami (d. 874) are a mausoleum, ...
coal mining
Accesses to a coal seam, called portals, are the first to be completed and generally the last to be sealed. A large coal mine will have several portals. Their locations and the types of facilities ...
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