The Collaborative International Dictionary of English v.0.48:

Snow \Snow\, n. [OE. snow, snaw, AS. sn[=a]w; akin to D. sneeuw,
   OS. & OHG. sn[=e]o, G. schnee, Icel. sn[ae]r, snj[=o]r,
   snaj[=a]r, Sw. sn["o], Dan. snee, Goth. snaiws, Lith.
   sn["e]gas, Russ. snieg', Ir. & Gael. sneachd, W. nyf, L. nix,
   nivis, Gr. acc. ni`fa, also AS. sn[imac]wan to snow, G.
   schneien, OHG. sn[imac]wan, Lith. snigti, L. ningit it snows,
   Gr. ni`fei, Zend snizh to snow; cf. Skr. snih to be wet or
   sticky. [root]172.]
   1. Watery particles congealed into white or transparent
      crystals or flakes in the air, and falling to the earth,
      exhibiting a great variety of very beautiful and perfect
      forms.
      [1913 Webster]

   Note: Snow is often used to form compounds, most of which are
         of obvious meaning; as, snow-capped, snow-clad,
         snow-cold, snow-crowned, snow-crust, snow-fed,
         snow-haired, snowlike, snow-mantled, snow-nodding,
         snow-wrought, and the like.
         [1913 Webster]

   2. Fig.: Something white like snow, as the white color
      (argent) in heraldry; something which falls in, or as in,
      flakes.
      [1913 Webster]

            The field of snow with eagle of black therein.
                                                  --Chaucer.
      [1913 Webster]

   Red snow. See under Red.
      [1913 Webster]

   Snow bunting. (Zool.) See Snowbird, 1.

   Snow cock (Zool.), the snow pheasant.

   Snow flea (Zool.), a small black leaping poduran
      (Achorutes nivicola) often found in winter on the snow
      in vast numbers.

   Snow flood, a flood from melted snow.

   Snow flower (Bot.), the fringe tree.

   Snow fly, or Snow insect (Zool.), any one of several
      species of neuropterous insects of the genus Boreus. The
      male has rudimentary wings; the female is wingless. These
      insects sometimes appear creeping and leaping on the snow
      in great numbers.

   Snow gnat (Zool.), any wingless dipterous insect of the
      genus Chionea found running on snow in winter.

   Snow goose (Zool.), any one of several species of arctic
      geese of the genus Chen. The common snow goose (Chen
      hyperborea), common in the Western United States in
      winter, is white, with the tips of the wings black and
      legs and bill red. Called also white brant, wavey, and
      Texas goose. The blue, or blue-winged, snow goose (Chen
      coerulescens) is varied with grayish brown and bluish
      gray, with the wing quills black and the head and upper
      part of the neck white. Called also white head,
      white-headed goose, and bald brant.

   Snow leopard (Zool.), the ounce.

   Snow line, lowest limit of perpetual snow. In the Alps this
      is at an altitude of 9,000 feet, in the Andes, at the
      equator, 16,000 feet.

   Snow mouse (Zool.), a European vole (Arvicola nivalis)
      which inhabits the Alps and other high mountains.

   Snow pheasant (Zool.), any one of several species of large,
      handsome gallinaceous birds of the genus Tetraogallus,
      native of the lofty mountains of Asia. The Himalayn snow
      pheasant (Tetraogallus Himalayensis) in the best-known
      species. Called also snow cock, and snow chukor.

   Snow partridge. (Zool.) See under Partridge.

   Snow pigeon (Zool.), a pigeon (Columba leuconota) native
      of the Himalaya mountains. Its back, neck, and rump are
      white, the top of the head and the ear coverts are black.


   Snow plant (Bot.), a fleshy parasitic herb (Sarcodes
      sanguinea) growing in the coniferous forests of
      California. It is all of a bright red color, and is fabled
      to grow from the snow, through which it sometimes shoots
      up.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snowbird \Snow"bird\, n. (Zool.)
   (a) An arctic finch (Plectrophenax nivalis syn.
       Plectrophanes nivalis) common, in winter, both in
       Europe and the United States, and often appearing in
       large flocks during snowstorms. It is partially white,
       but variously marked with chestnut and brown. Called also
       snow bunting, snowflake, snowfleck, and
       snowflight.
   (b) Any finch of the genus Junco which appears in flocks in
       winter time, especially Junco hyemalis in the Eastern
       United States; -- called also blue snowbird. See
       Junco.
   (c) The fieldfare. [Prov. Eng.]
       [1913 Webster]

WordNet (r) 3.0 (2006):

snow bunting
    n 1: white Arctic bunting [syn: snow bunting, snowbird,
         snowflake, Plectrophenax nivalis]