(n.) An opening between the corbels which support a projecting parapet, or in the floor of a gallery or the roof of a portal, shooting or dropping missiles upen assailants attacking the base of the walls. Also, the construction of such defenses, in general, when of this character. See Illusts. of Battlement and Castle.
(n.) The act of discharging missiles or pouring burning or melted substances upon assailants through such apertures.
Example Sentences:
Portal
Definition:
(n.) A door or gate; hence, a way of entrance or exit, especially one that is grand and imposing.
(n.) The lesser gate, where there are two of different dimensions.
(n.) Formerly, a small square corner in a room separated from the rest of the apartment by wainscoting, forming a short passage to another apartment.
(n.) By analogy with the French portail, used by recent writers for the whole architectural composition which surrounds and includes the doorways and porches of a church.
(n.) The space, at one end, between opposite trusses when these are terminated by inclined braces.
(n.) A prayer book or breviary; a portass.
(a.) Of or pertaining to a porta, especially the porta of the liver; as, the portal vein, which enters the liver at the porta, and divides into capillaries after the manner of an artery.
Example Sentences:
(1) Maximum increases in portal plasma secretin concentrations of 143, 146 and 190% and maximum increases in VIP of 116, 155 and 147% after, respectively, intraduodenal 0.1 M NaHCO3, 0.1 M Na2CO3, and 0.025 M NaOH were found.
(2) The statistical T value calculated for the LP-TAE group showed that the administration of LP, the tumor size, intrahepatic metastasis, portal vein infiltration, and serum total bilirubin and alpha-fetoprotein levels significantly (P < 0.01) affected the patients' survival.
(3) In one of the cirrhotic patients, postmortem correlation of sonographic, angiographic, and pathological findings showed that the dilated vessels seen on sonography were cystic veins draining normally into the portal vein rather than portosystemic anastomoses.
(4) Portal venous blood flow was reduced by approximately 30%.
(5) The concomitant reduction in aortic pressure and increase in heart rate following total occlusion of the portal vein were most pronounced during the first weeks after stenosis, and were probably due to diminished venous return to the heart.
(6) In cancer of the pancreas head, cancer cells could invade the portal vein and perineural space of the celiac plexus, and metastasize to regional lymph nodes around the celiac axis.
(7) Immediate hemostasis was not influenced by the etiology of portal hypertension.
(8) Portal vein ligation resulted in testicular atrophy and low serum testosterone concentrations.
(9) In chronic active hepatitis and liver cirrhosis, both carbohydrate antigen 19-9 positive biliary ductular cells and factor VIII-related antigen positive endothelial cells were not only observed in the enlarged portal area but also extended into the parenchyma.
(10) Compared with the portal vein, lymphatic duct revealed a greater resistance to hypoxia.
(11) The presence of vital and sensitive organs such as the spinal cord, heart, and lungs makes curative radiotherapy of non-small cell lung cancer difficult to implement and necessitates use of oblique portals.
(12) Thirty patients were evaluated in a blind fashion to study the effect of oral propranolol on portal hypertension of varied aetiology.
(13) These results indicate that the pars tuberalis forms and secretes LH via the hypophyseal portal circulation.
(14) Pregnant females displayed a greater hyperinsulinemia both in the portal vein and the artery over the first hour.
(15) A low-sodium diet (0.05% Na+, control 0.5% Na+) significantly lowered stimulated [3H]NE release from portal vein and anterior hypothalamus in SHR and WKY at all three ages.
(16) Changes in mean portal venous and aortic blood glucose and lactate concentrations after an intragastric infusion of d-glucose to chronically catheterized rats (after regaining preoperative weight) were compared to those of acutely catheterized rats (1 h after catheter placement).
(17) On angiography portal-hepatic venous shunt was observed in one case.
(18) Terlipressin (Glypressin), a synthetic analog of vasopressin, induces arteriolar vasoconstriction which causes both a portal hypotensive effect and certain side-effects on the systemic circulation (elevated arterial pressure and reduced cardiac output).
(19) Portal lipogranulomas show a distinctive morphology with fat vacuoles surrounded by macrophages.
(20) A technique of diversion of the gastroduodenal vein in a canine model is described to compare long-term metabolic effects of systemic versus portal pancreatic endocrine drainage.