| althea | <botany> A genus of plants of the Mallow family. It includes the officinal marsh mallow, and the garden hollyhocks. An ornamental shrub (Hibiscus Syriacus) of the Mallow family. Origin: althaea, Gr. Source: Websters Dictionary (01 Mar 1998) |
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| altheine | <chemistry> Asparagine. Source: Websters Dictionary (01 Mar 1998) |
| Altherr, Franz | <person> See: Meyenburg-Altherr-Uehlinger syndrome. (05 Mar 2000) |
| althesin | <chemical> 3-hydroxypregnane-11,20-dione mixture with 21-(acetyloxy)-3-hydroxypregnane-11,20-dione (3:1). A 3:1 mixture of alfaxalone with alfadolone acetate that previously had been used as a general anaesthetic. It is no longer actively marketed. Chemical name: Pregnane-11,20-dione, 21-(acetyloxy)-3-hydroxy-, (3alpha,5alpha)-, mixt. With (3alpha,5alpha)-3-hydroxypregnane-11,20-dione (12 Dec 1998) |
| altiscope | <instrument> An arrangement of lenses and mirrors which enables a person to see an object in spite of intervening objects. Origin: L. Altus high + Gr. To view. Source: Websters Dictionary (01 Mar 1998) |
| altitude | 1. Space extended upward; height; the perpendicular elevation of an object above its foundation, above the ground, or above a given level, or of one object above another; as, the altitude of a mountain, or of a bird above the top of a tree. 2. <astronomy> The elevation of a point, or star, or other celestial object, above the horizon, measured by the arc of a vertical circle intercepted between such point and the horizon. It is either true or apparent; true when measured from the rational or real horizon, apparent when from the sensible or apparent horizon. 3. <geometry> The perpendicular distance from the base of a figure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, etc. 4. Height of degree; highest point or degree. "He is [proud] even to the altitude of his virtue." (Shak) 5. Height of rank or excellence; superiority. 6. Elevation of spirits; heroics; haughty airs. "The man of law began to get into his altitude." (Sir W. Scott) Meridian altitude, an arc of the meridian intercepted between the south point on the horizon and any point on the meridian. See Meridian. Origin: L. Altitudo, fr. Altus high. Cf. Altar, Haughty, Enhance. Source: Websters Dictionary (01 Mar 1998) |
| altitude chamber | A decompression chamber for simulating a high altitude environment, particularly its low barometric pressure. Synonym: high altitude chamber. (05 Mar 2000) |
| altitude disease | A condition that results from prolonged exposure to high altitude. Symptoms include a continuous dry cough, shortness of breath, poor exercise tolerance, dizziness, headache, sleep difficulty, anorexia, confusion, fatigue and a rapid pulse. Treatment includes the immediate movement to a lower altitude. Prophylaxis has been accomplished successfully with the use of acetazolamide (Diamox). (27 Sep 1997) |
| altitude erythraemia | Loss of high altitude tolerance after prolonged exposure (e.g., by residence), characterised by extreme polycythemia, exaggerated hypoxaemia, and reduced mental and physical capacity; relieved by descent. Synonym: altitude erythraemia, chronic soroche, Monge's disease. (05 Mar 2000) |
| altitude sickness | A condition that results from prolonged exposure to high altitude. Symptoms include a continuous dry cough, shortness of breath, poor exercise tolerance, dizziness, headache, sleep difficulty, anorexia, confusion, fatigue and a rapid pulse. Treatment includes the immediate movement to a lower altitude. Prophylaxis has been accomplished successfully with the use of acetazolamide (Diamox). (27 Sep 1997) |
| altitudinal | Relating to vertical relationships; e.g., altitudinal hemianopsia. (05 Mar 2000) |
| altitudinal hemianopia | A defect in the visual field in which the upper or lower half is lost; may be unilateral or bilateral. (05 Mar 2000) |
| Altmann's anilin-acid fuchsin stain | <technique> A mixture of picric acid, anilin, and acid fuchsin which stains mitochondria crimson against a yellow background. (05 Mar 2000) |
| Altmann's fixative | A bichromate-osmic acid fixative. (05 Mar 2000) |
| Altmann's granule | A granule that has an affinity for fuchsin. Synonym: Altmann's granule. (05 Mar 2000) |
| alteplase |
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| alter |
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| alteregoism |
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| alternariosis |
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| alternating |
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| ALT | reverse, as of direction, attitude, or course of action |
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| ALT | be an understudy or alternate for a role |
| ALT | exchange people temporarily to fulfill certain jobs and functions |
| ALT | occurring by turns |
| ALT | every second one of a series |
| ALT | (botany) of leaves and branches etc |
| ALT | allowing a choice |
| ALT | in an alternating sequence or position |
| ALT | occurring by turns |
| ALT | (electricity) of a current that reverses direction at regular intervals |
| ALT | an electric current that reverses direction sinusoidally |
| ALT | successive change from one thing or state to another and back again |