| 单词 | nival | 
| 释义 | nivaladj. Chiefly Ecology and Physical Geography.  1.  Snowy, resembling snow; formed from or in snow. Cf. niveous adj. ΘΚΠ the world > the earth > weather and the atmosphere > weather > precipitation or atmospheric moisture > snow > 			[adjective]		 > relating to snow nival1656 1656    T. Blount Glossographia  				Nival, pertaining to Snow, white or cold like Snow, snowy. 1881    Amer. Naturalist 15 519  				This nival covering is not a shroud to conceal the dead, but a warm comforter spread over the earth's slumbering forces by that Great, Good Hand ‘which giveth snow like wool’. 1978    Arctic & Alpine Res. 10 117  				Nival surface conditions differ widely. 1994    Jrnl. Mammalogy 75 420  				Six of 20 nival shelters used by nonparturient females [sc. polar bears] were located on the sea ice.  2.  Designating a region of perpetual snow; growing in or characteristic of such a region. ΘΚΠ the world > plants > by habitat or distribution > 			[adjective]		 > that grow in cold environments or at high altitude uplandish1545 upland1639 alpestrine1787 alpestral1852 nival1884 microthermal1901 microthermic1903 microtherm1964 1884    Science 21 Nov. 475/2  				Monte Rosa contains the richest nival flora. 1937    Jrnl. Ecol. 25 130  				The Tongariro spectra compare with those of Raunkiaer..while those for Mount Cook are more like his for the nival region of the Alps in general. 1967    M. J. Coe Ecol. Alpine Zone Mt. Kenya 18  				The nival zone..is best restricted to that very narrow zone adjacent to the glaciers and recent moraines. 1994    Sci. News 18 June 399/2  				Not only do former residents of the nival zone, the area above about 2,000 meters, move up, but former alpine plants ascend to the nival region.  3.  Relating to, characterized by, or caused by nivation or (more generally) the falling, accumulation, or melting of snow. ΚΠ 1970    Proc. Helsinki Symp. Ecol. Subarctic Regions 1966 90/2  				Changing nival conditions is just as reasonable an explanation for the extirpation of such groups as Rangifer t. dawsoni. 1983    Arctic & Alpine Res. 15 321  				The laminae..probably represent discrete inflow events such as nival floods. 1996    Jrnl. Paleolimnol. 16 169  				Suspension settling is the dominant process of deposition depending upon stream discharge which is controlled by nival melt and summer temperatures. This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022). <  | 
	
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