| HFO | high-frequency oscillator; high-frequency oscillatory [ventilation] |
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| HFT | high-frequency transduction; high-frequency transfer |
| HIHA | high impulsiveness, high anxiety |
| HPF | heparin-precipitable fraction; hepatic plasma flow; high-pass filter; high-power field [microscope];... |
| HRP | high-risk patient; high-risk pregnancy; histidine-rich protein; horseradish peroxidase |
| high | 1. Elevated above any starting point of measurement, as a line, or surface; having altitude; lifted up; raised or extended in the direction of the zenith; lofty; tall; as, a high mountain, tower, tree; the sun is high. 2. Regarded as raised up or elevated; distinguished; remarkable; conspicuous; superior; used indefinitely or relatively, and often in figurative senses, which are understood from the connection. Elevated in character or quality, whether moral or intellectual; preeminent; honorable; as, high aims, or motives. "The highest faculty of the soul." Exalted in social standing or general estimation, or in rank, reputation, office, and the like; dignified; as, she was welcomed in the highest circles. "He was a wight of high renown." (Shak) Of noble birth; illustrious; as, of high family. Of great strength, force, importance, and the like; strong; mighty; powerful; violent; sometimes, triumphant; victorious; majestic, etc.; as, a high wind; high passions. "With rather a high manner." "Strong is thy hand, and high is thy right hand." (Ps. Lxxxix. 13) "Can heavenly minds such high resentment show?" (Dryden) Very abstract; difficult to comprehend or surmount; grand; noble. "Both meet to hear and answer such high things." (Shak) "Plain living and high thinking are no more." (Wordsworth) Costly; dear in price; extravagant; as, to hold goods at a high price. "If they must be good at so high a rate, they know they may be safe at a cheaper." (South) Arrogant; lofty; boastful; proud; ostentatious; used in a bad sense." "An high look and a proud heart . . . Is sin." (Prov. Xxi. 4) "His forces, after all the high discourses, amounted really but to eighteen hundred foot." (Clarendon) 3. Possessing a characteristic quality in a supreme or superior degree; as, high (i. E, intense) heat; high (i. E, full or quite) noon; high (i. E, rich or spicy) seasoning; high (i. E, complete) pleasure; high (i. E, deep or vivid) colour; high (i. E, extensive, thorough) scholarship, etc. "High time it is this war now ended were." (Spenser) "High sauces and spices are fetched from the Indies." (Baker) 4. Strong-scented; slightly tainted; as, epicures do not cook game before it is high. 5. Acute or sharp; opposed to grave or low; as, a high note. 6. Made with a high position of some part of the tongue in relation to the palate, as e (eve), oo (food). High admiral, the chief admiral. High altar, the principal altar in a church. High and dry, out of water; out of reach of the current or tide; said of a vessel, aground or beached. High and mighty arrogant; overbearing. High art, art which deals with lofty and dignified subjects and is characterised by an elevated style avoiding all meretricious display. High bailiff, the chief bailiff. High Church, and Low Church, two ecclesiastical parties in the Church of England and the Protestant Episcopal Church. The high-churchmen emphasize the doctrine of the apostolic succession, and hold, in general, to a sacramental presence in the Eucharist, to baptismal regeneration, and to the sole validity of Episcopal ordination. They attach much importance to ceremonies and symbols in worship. Low-churchmen lay less stress on these points, and, in many instances, reject altogether the peculiar tenets of the high-church school. See Broad Church. High constable, the open sea; the part of the ocean not in the territorial waters of any particular sovereignty, usually distant three miles or more from the coast line. High steam, steam having a high pressure. High steward, the chief steward. High tea, tea with meats and extra relishes. High tide, the greatest flow of the tide; high water. High time. Quite time; full time for the occasion. A time of great excitement or enjoyment; a carousal. High treason, treason against the sovereign or the state, the highest civil offense. See Treason. It is now sufficient to speak of high treason as treason simply, seeing that petty treason, as a distinct offense, has been abolished. High water, the utmost flow or greatest elevation of the tide; also, the time of such elevation. High-water mark. That line of the seashore to which the waters ordinarily reach at high water. A mark showing the highest level reached by water in a river or other body of fresh water, as in time of freshet. <botany> High-water shrub, a composite shrub (Iva frutescens), growing in salt marshes along the Atlantic coast of the United States. High wine, distilled spirits containing a high percentage of alcohol; usually in the plural. To be on a high horse, to be on one's dignity; to bear one's self loftily. With a high hand. With power; in force; triumphantly. "The children of Israel went out with a high hand." In an overbearing manner, arbitrarily. "They governed the city with a high hand." . Synonym: Tall, lofty, elevated, noble, exalted, supercilious, proud, violent, full, dear. See Tall. Origin: OE. High, hegh, hey, heh, AS. Heah, hh; akin to OS. Hh, OFries. Hag, hach, D. Hoog, OHG. Hh, G. Hoch, Icel. Hr, Sw. Hog, Dan. Hoi, Goth. Hauhs, and to Icel. Haugr mound, G. Hugel hill, Lith. Kaukaras. Source: Websters Dictionary (01 Mar 1998) |
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| high altitude cerebral oedema | <physiology> A serious condition that results from the sudden increase in pressure within the brain due to swelling. This is thought to occur secondary to exposure to high altitudes, generally in excess of 12,000 feet. (12 Jan 1998) |
| high altitude chamber | A decompression chamber for simulating a high altitude environment, particularly its low barometric pressure. Synonym: high altitude chamber. (05 Mar 2000) |
| high altitude pulmonary oedema | <physiology> The abnormal deposition of fluid into the lungs that occurs with exposure to lower barometric pressure and low oxygen. (12 Jan 1998) |
| high altitude sickness | A condition that results from the exposure to lower barometric pressure (lower oxygen concentration). Synonym: acute mountain sickness. (27 Sep 1997) |
| high blood cholesterol | A condition where there is an above normal level of cholesterol in the bloodstream. A level of over 200 mg/dl is known to be a risk factor for heart disease. Less than 200 is desirable, 200 to 239 is considered borderline high, over 240 is considered high. (27 Sep 1997) |
| high blood pressure | <cardiology> Persistently high arterial blood pressure. Hypertension may have no known cause (essential or idiopathic hypertension) or be associated with other primary diseases (secondary hypertension). This condition is considered a risk factor for the development of heart disease, peripheral vascular disease, stroke and kidney disease. (29 Sep 1997) |
| high blood triglyceride | <biochemistry> Elevation of triglycerides, a fatty substance found in the bloodstream. Normal triglyceride blood levels should be 10-150 milligrams per decilitre. Elevations of the triglyceride level (particularly in association with elevated cholesterol) have been correlated with the development of atherosclerosis, the underlying cause of heart disease and stroke. Origin: Gr. Haima = blood (27 Sep 1997) |
| high-bred | Bred in high life; of pure blood. Source: Websters Dictionary (01 Mar 1998) |
| high-calorie diet | A diet containing upward of 4,000 calories per day. (05 Mar 2000) |
| high convex | The segment of a sphere of short radius. (05 Mar 2000) |
| high density lipoprotein | <biochemistry> These lipoproteins acts to carry cholesterol in the bloodstream. Raised high density lipoprotein levels have been correlated with a lower risk for heart disease. Less than 35 mg/dl is considered a positive risk factor for coronary artery disease, over 60 mg/dl is considered a negative risk factor (reduces your risk of heart disease). Recent studies show a low high density lipoprotein level is the strongest predictor of cardiovascular death in women. Acronym: HDL (18 Nov 1997) |
| high dose tolerance | The induction of tolerance by exposure to high doses of antigen. (05 Mar 2000) |
| high-egg-passage vaccine | Living Flury strain rabies virus at the 180th to 190th level egg passage (embryonate eggs), used for vaccination of cattle and cats, low-egg-passage (LEP) vaccine: at the 40th to 50th passage level, containing 103 to 104 mouse LD50; nonpathogenic in dogs but retains some pathogenicity for cattle and cats. (05 Mar 2000) |
| high endothelial postcapillary venules | Venule's in the lymph nodes, tonsils, and Peyer's patches that have a high-walled endothelium through which blood lymphocytes migrate into the lymphatic parenchyma. (05 Mar 2000) |