Vasodilation (medicine) and main(1) (iou)

Vasodilation (medicine)

vasodilation

The increase in the internal diameter of a blood vessel that results from relaxation of smooth muscle within the wall of the vessel. This causes an increase in blood flow, but a decrease in systemic vascular resistance.

main(1) (iou)

main adjective. OE.
[Partly repr. MAIN noun1 in comb., partly from Old Norse megenn, megn (in comb. megin) strong, powerful.]
a. Of an action etc.: manifesting or requiring great force or energy. OE-L17.
H. Foulis She also gave a main stroke against Cecchino.
b. Of strength etc.: exerted to the full, sheer. Now chiefly in by main force. OE.
Sir W. Scott Yet with main strength his strokes he drew.
c. Strong, potent; esp. (of a sound) loud. Long arch. rare. LME.
Joyce And he answered with a main cry: Abba! Adonai!
d. Of motion etc.: swift, speedy, rapid. L16-M17.
J. Fletcher Making with all maine speed to th' port.
(Of an army) large, powerful; esp. designating a complete and fully equipped force as opp. to a small or irregular one. Also, designating a pitched battle as opp. to a skirmish. OE-M17.
R. Carew To withstand any great Navie or maigne invasion. T. Shelton This Giant..would pass with a main power into my Land.
a. Of a material object: of great size or bulk. obsolete exc. dial. OE.
Milton Themselves invaded next, and on their heads Main Promontories flung.
b. Of a quantity or amount: large. obsolete exc. dial. E17.
a. Esp. of an action, a quality, etc.: very great in degree, value, etc.; highly remarkable for a specified quality; very great or considerable of its kind. (Occas. with compar. & superl.) obsolete exc. dial. OE.
D. Featley This is one of our mainest exceptions against the Roman Church. R. L. Stevenson It [an island] were a main place for pirates once.
b. Of a person, an agent: great, remarkable, or pre-eminent for the quality or characteristics indicated. obsolete exc. dial. LME.
R. B. Sheridan I am a main bungler at a long story.
a. Of a person: powerful, high in rank or position. rare. OE-E17.
J. Fletcher So main a person, A man of so much Noble note and honour.
b. Of an affair, event, etc.: highly important; having great results or important consequences; momentous. L16-L17.
Milton All commit the care And Management of this main enterprise To him their great Dictator.
Of a body of flowing water: in flood; large, full-flowing. Also, designating the ocean or the open sea. ME-E17.
Shakespeare Merchant of Venice And bid the main flood bate his usual height.
Nautical. Pertaining to, connected with, or near the mainmast or mainsail. LME.
John Ross The main and fore hatchway.
a. Chief or principal in permanent relation to others of the same kind. L15.
W. Irving After turning from the main road up a narrow lane. Encyclopedia Britannica A rate of fall of 1 in 120..is desirable..for a main sewer.
b. Greater or more important than others of the same kind; pre-eminent; leading. L16.
H. Rogers I went carefully over all the main points of the argument. E. A. Freeman The statements may be grouped under two main heads.
a. Designating a considerable, uninterrupted stretch of land, water, space, etc. M16.
Milton Over all the face of Earth Main Ocean flow'd.
b. Of earth, rock: forming the principal or entire mass; solid. M16-M17.
a. Chief in size or extent; constituting the bulk or principal part; designating the chief part of the thing specified. L16.
Wellington The main body of the allied army. Ld Macaulay The sturdy country gentlemen who formed the main strength of the Tory party.
b. Referring or pertaining to all or the majority; General. L16-M17.
Shakespeare Henry VIII By the main assent Of all these learned men, she was divorced.
Phrases: main and dial. = MAIN adverb. the Main Plot Hist. the more important of two plots against the government of James I (opp. the Bye Plot).
Special collocations & comb.: main beam (a) a principal beam which transmits a load directly to a column; (b) the undipped beam of the headlights of a motor vehicle. main body the body of troops forming the chief part of an army or armed force, occupying the space between the vanguard and the rear. main brace noun1 [BRACE noun2] Nautical the brace attached to the main yard; splice the main brace (Hist.), serve an extra rum ration. main brace noun2 [BRACE noun1] a principal brace; Mechanics in a system of braces, the one that takes the principal strain. main breadth Nautical the broadest part of a ship at a particular timber or frame. main chance (a) = MAIN noun3 1b; chiefly fig., the likely outcome, the most important point risked or at stake; (b) something which is of principal importance, esp. the opportunity of enriching or otherwise benefiting oneself; an eye to the main chance, consideration for one's own interests. main chancer an opportunist, a person who has an eye to the main chance. main couple the principal truss in a roof. main course (a) any of a number of substantial dishes in a large menu; the principal dish of a meal; (b) Nautical (now rare or obsolete) a mainsail. main crop the chief crop, excluding the early and late varieties or sections. maincrop adjective of or pertaining to the main crop. main deck Nautical (a) the deck next below the spar-deck in a man-of-war; (b) the upper deck between the poop and the forecastle in a merchantman. main dish = main course (a) above. main drag: see DRAG noun 11. mainframe Computing orig., the central processing unit of a computer; now usu., any large or General-purpose computer, esp. one supporting numerous peripherals etc. main guard Hist. (a) Fortification the keep of a castle; the part of the building in which the main guard (sense (b) below) is lodged; (b) a body of troops constituting a guard, esp. a body of cavalry posted on the wings of a camp towards the enemy; a guard in a fortress taking custody of disturbers of the peace etc. main half-breadth Nautical a section of the broadest part of a ship. main line (a) a chief railway line; (b) a principal route, a connection, conduit, etc.; (c) slang a principal vein, esp. as a site for (illicit) drug injection; (the action or habit of making) such an injection (cf. MAINLINE); (d) US a chief road or street. main-line adjective of or pertaining to a main line. main man (a) (colloq., chiefly US) a favourite male friend; a man admired for his achievements; (b) a principal male figure in an organization, team, etc. mainmast the principal mast in a ship. mainplane Aeronautics a principal supporting surface of an aircraft (as distinguished from a tailplane). main range Austral. & NZ the principal ridge of a chain of mountains. mainsail Nautical the principal sail of a ship; esp. the lowest sail on the mainmast in a square-rigged vessel; the sail set on the after part of the mainmast in a fore-and-aft rigged vessel. main sea arch. the high sea; = MAIN noun1 5a. main sequence Astronomy a series of star types represented on a Hertzsprung-Russell diagram as a continuous band extending from the upper left (hot bright stars) to the lower right (cool dim stars), to which most stars belong (cf. DWARF noun 3). mainsheet (a) Nautical the rope which controls the boom of the mainsail when set; (b) slang in Jamaica, a drink of rum and water. mainspring (a) the principal spring in a piece of mechanism, esp. in a watch, clock, etc.; (b) fig. the chief motive power, the main incentive. main squeeze N. Amer. slang (a) an important person; (b) a person's principal friend of the opposite sex. mainstay (a) Nautical the stay which extends from the maintop to the foot of the foremast; mainstay sail, a storm-sail set on the mainstay; (b) fig. a chief support. main stem (a) the principal stem (lit. & fig.); (b) US slang the main street of a town etc. mainstream noun, adjective, & verb (a) noun the principal stream or river etc.; the prevailing trend of opinion, Fashion, etc.; Education the stream or class for those without Special Needs; (b) adjective of or pertaining to the mainstream; (of jazz) neither traditional nor modern; belonging to or characteristic of an established field of activity; (c) verb trans. & intrans. incorporate into the mainstream; spec. in Education, place (a pupil) in a class for those without Special Needs. main street (as a name also with cap. initials) the principal street of a town; fig. (after Sinclair Lewis's novel Main Street, 1920) the mediocrity, parochialism, or materialism regarded as typical of small-town life. mainstreeting N. Amer. political campaigning in main streets to win electoral support. maintop Nautical the top of a mainmast; the platform above the head of the lower mainmast. main-topgallant adjective (Nautical) designating the mast, sail, yard, etc., above the maintopmast and maintopsail. maintopmast Nautical the mast above the lower mainmast. maintopsail Nautical the sail above the mainsail. main-ward (a) the main body of an army; (b) the principal ward of a lock. mainway the gangway or principal passage in a mine. main-yard Nautical the yard on which the mainsail is extended.

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