| marsh | <ecology> A tract of wet land principally inhabitated by partially-submerged herbaceous vegetation. (05 Jan 1998) |
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| marsh fever | See malaria. (12 Dec 1998) |
| marsh gas | <chemistry> A light, colourless, gaseous, inflammable hydrocarbon, CH4; marsh gas. See Marsh gas, under Gas. <chemistry> Methane series, a series of saturated hydrocarbons, of which methane is the first member and type, and (because of their general chemical inertness and indifference) called also the paraffin (little affinity) series. The lightest members are gases, as methane, ethane; intermediate members are liquids, as hexane, heptane, etc. (found in benzine, kerosene, etc); while the highest members are white, waxy, or fatty solids, as paraffin proper. Source: Websters Dictionary (01 Mar 1998) |
| marsh marigold | <botany> A perennial plant of the genus Caltha (C. Palustris), growing in wet places and bearing bright yellow flowers. In the United States it is used as a pot herb under the name of cowslip. See Cowslip. Source: Websters Dictionary (01 Mar 1998) |
| Marshall syndrome | <syndrome> Syndrome of mid-face hypoplasia, cataract, sensorineural hearing loss, and hypohidrosis. It is disputed whether this syndrome is distinct from Stickler's syndrome. (05 Mar 2000) |
| Marshall test | Manual deviation of bladder neck during strain or cough to ascertain presence of stress urinary incontinence. Synonym: Bonney test, Marshall-Marchetti test. (05 Mar 2000) |
| Marshall's method | A quantitative procedure for estimating free and conjugated sulfanilamide in body fluids. (05 Mar 2000) |
| Marshall's oblique vein | A small vein on the posterior wall of the left atrium which merges with the great cardiac vein to form the coronary sinus; it is developed from the left common cardinal vein, and occasionally persists as a left superior vena cava. Synonym: vena obliqua atrii sinistri, Marshall's oblique vein. (05 Mar 2000) |
| Marshall's vestigial fold | A pericardial fold lying between the left oblique vein of the atrium and the left superior pulmonary vein containing the obliterated remains of the left superior vena cava. Synonym: plica venae cavae sinistrae, Marshall's vestigial fold, vestigial fold. (05 Mar 2000) |
| Marshall, Don | <person> U.S. Ophthalmologist, *1905. See: Marshall syndrome. (05 Mar 2000) |
| Marshall, Eli | <person> U.S. Pharmacologist, 1889-1966. See: Marshall's method. (05 Mar 2000) |
| Marshall, John | <person> English anatomist, 1818-1891. See: Marshall's vestigial fold, Marshall's oblique vein. (05 Mar 2000) |
| Marshall, Victor | <person> U.S. Urologist, *1913. See: Marshall-Marchetti-Krantz operation. (05 Mar 2000) |
| Marshall-Marchetti test | Manual deviation of bladder neck during strain or cough to ascertain presence of stress urinary incontinence. Synonym: Bonney test, Marshall-Marchetti test. (05 Mar 2000) |
| Marshall-Marchetti-Krantz operation | An operation for urinary stress incontinence, performed retropubically. (05 Mar 2000) |
| salt marsh | A community of organisms dominated by plants that are tolerant of wet, saline soils, generally found in low-lying coastal habitats which are periodically wet and unusually saline to hypersaline. The term salt marsh summarizes the saline conditions of the habitat as well as the emergent vegetation which dominates it. Plants which grow in salt marshes are thus tolerant of two conditions: saline and wet. (09 Oct 1997) |
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| salt water marsh | Wetland dominated by herbaceous plants under the influence of saline waters. May be coastal (tidal) or perched. (09 Oct 1997) |
| freshwater marsh | <ecology> Wetland dominated by herbaceous plants under the influence of fresh water. (09 Oct 1997) |