| umbrella | 1. A shade, screen, or guard, carried in the hand for sheltering the person from the rays of the sun, or from rain or snow. It is formed of silk, cotton, or other fabric, extended on strips of whalebone, steel, or other elastic material, inserted, or fastened to, a rod or stick by means of pivots or hinges, in such a way as to allow of being opened and closed with ease. See Parasol. "Underneath the umbrella's oily shed." (Gay) 2. <zoology> The umbrellalike disk, or swimming bell, of a jellyfish. 3. <zoology> Any marine tectibranchiate gastropod of the genus Umbrella, having an umbrella-shaped shell; called also umbrella shell. <zoology> Umbrella ant, a South American bird (Cephalopterus ornatus) of the family Cotingidae. It is black, with a large handsome crest consisting of a mass of soft, glossy blue feathers curved outward at the tips. It also has a cervical plume consisting of a long, cylindrical dermal process covered with soft hairy feathers. Called also dragoon bird. <botany> Umbrella leaf, a kind of magnolia (M. Umbrella) with the large leaves arranged in umbrellalike clusters at the ends of the branches. It is a native of Pennsylvania, Virginia, and Kentucky. Other plants in various countries are called by this name, especially a kind of screw pine (Pandanus odoratissimus). Origin: It. Umbrella, fr. Ombra a shade, L. Umbra; cf. L. Umbella a sunshade, a parasol. Cf. Umbel, Umbrage. Source: Websters Dictionary (01 Mar 1998) |
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| umbrella f. |
the most common kind of vena cava filter for prevention of pulmonary embolism; it is inserted in a folded position and springs open like an umbrella to engage the caval wall. Common types are the Greenfield filter and Mobin-Uddin filter.
Ãâó: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| umbrella i. |
i. bombé.
Ãâó: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| umbrella filter |
SEE: filter.
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| umbrella | having the function of uniting a group of similar things |
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| umbrella | a formation of military planes maintained over ground operations or targets |
| umbrella | a lightweight handheld collapsible canopy |
| umbrella | covering or applying simultaneously to a number of similar items or elements or groups |
| umbrella | foul-smelling somewhat fleshy tropical plant of southeastern Asia cultivated for its edible corms or in the greenhouse for its large leaves and showy dark red spathe surrounding a large spadix |
| umbrella | black tropical American bird having a large overhanging crest and long feathered wattle |
| umbrella | large Australasian fern with fanlike repeatedly forked fronds |
| umbrella | small deciduous open-crowned tree of eastern North America having creamy white flowers and large leaves in formations like umbrellas at the ends of branches |
| umbrella | medium-sized 2-needled pine of southern Europe having a spreading crown |
| umbrella | African sedge widely cultivated as an ornamental water plant for its terminal umbrellalike cluster of slender grasslike leaves |
| umbrella | late-blooming perennial plant of shale barrens of Virginia having flowers in flat-topped clusters |
| umbrella | rhizomatous perennial herb with large dramatic peltate leaves and white to bright pink flowers in round heads on leafless stems |
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