The Collaborative International Dictionary of English v.0.48:

Hazel \Ha"zel\ (h[=a]"z'l), n. [OE. hasel, AS. h[ae]sel; akin to
   D. hazelaar, G. hazel, OHG. hasal, hasala, Icel. hasl, Dan &
   Sw. hassel, L. corylus, for cosylus.]
   1. (Bot.) A shrub or small tree of the genus Corylus, as
      the Corylus avellana, bearing a nut containing a kernel
      of a mild, farinaceous taste; the filbert. The American
      species are Corylus Americana, which produces the common
      hazelnut, and Corylus rostrata. See Filbert. --Gray.
      [1913 Webster]

   2. A miner's name for freestone. --Raymond.
      [1913 Webster]

   Hazel earth, soil suitable for the hazel; a fertile loam.


   Hazel grouse (Zool.), a European grouse (Bonasa
      betulina), allied to the American ruffed grouse.

   Hazel hoe, a kind of grub hoe.

   Witch hazel. See Witch-hazel, and Hamamelis.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hazel \Ha"zel\, a.
   1. Consisting of hazels, or of the wood of the hazel;
      pertaining to, or derived from, the hazel; as, a hazel
      wand.
      [1913 Webster]

            I sit me down beside the hazel grove. --Keble.
      [1913 Webster]

   2. Of a light brown color, like the hazelnut. "Thou hast
      hazel eyes." --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

colorful \colorful\ adj.
   1. having striking color. Opposite of colorless.

   Note: [Narrower terms: changeable, chatoyant, iridescent,
         shot; deep, rich; flaming; fluorescent, glowing;
         prismatic; psychedelic; red, ruddy, flushed,
         empurpled]

   Syn: colourful.
        [WordNet 1.5]

   2. striking in variety and interest. Opposite of colorless
      or dull. [Narrower terms: brave, fine, gay, glorious;
      flamboyant, resplendent, unrestrained; flashy, gaudy,
      jazzy, showy, snazzy, sporty; picturesque]
      [WordNet 1.5]

   3. having color or a certain color; not black, white or grey;
      as, colored crepe paper. Opposite of colorless and
      monochrome.

   Note: [Narrower terms: tinted; touched, tinged; amber,
         brownish-yellow, yellow-brown; amethyst; auburn,
         reddish-brown; aureate, gilded, gilt, gold, golden;
         azure, cerulean, sky-blue, bright blue; bicolor,
         bicolour, bicolored, bicoloured, bichrome; blue,
         bluish, light-blue, dark-blue; blushful,
         blush-colored, rosy; bottle-green; bronze, bronzy;
         brown, brownish, dark-brown; buff; canary,
         canary-yellow; caramel, caramel brown; carnation;
         chartreuse; chestnut; dun; earth-colored,
         earthlike; fuscous; green, greenish, light-green,
         dark-green; jade, jade-green; khaki; lavender,
         lilac; mauve; moss green, mosstone; motley,
         multicolor, culticolour, multicolored, multicoloured,
         painted, particolored, particoloured, piebald, pied,
         varicolored, varicoloured; mousy, mouse-colored;
         ocher, ochre; olive-brown; olive-drab; olive;
         orange, orangish; peacock-blue; pink, pinkish;
         purple, violet, purplish; red, blood-red, carmine,
         cerise, cherry, cherry-red, crimson, ruby, ruby-red,
         scarlet; red, reddish; rose, roseate; rose-red;
         rust, rusty, rust-colored; snuff, snuff-brown,
         snuff-color, snuff-colour, snuff-colored,
         snuff-coloured, mummy-brown, chukker-brown; sorrel,
         brownish-orange; stone, stone-gray; straw-color,
         straw-colored, straw-coloured; tan; tangerine;
         tawny; ultramarine; umber; vermilion,
         vermillion, cinibar, Chinese-red; yellow, yellowish;
         yellow-green; avocado; bay; beige; blae
         bluish-black or gray-blue); coral; creamy; cress
         green, cresson, watercress; hazel; honey,
         honey-colored; hued(postnominal); magenta;
         maroon; pea-green; russet; sage, sage-green;
         sea-green] [Also See: chromatic, colored, dark,
         light.]

   Syn: colored, coloured, in color(predicate).
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

hazel
    adj 1: of a light brown or yellowish brown color
    n 1: Australian tree grown especially for ornament and its fine-
         grained wood and bearing edible nuts [syn: hazel, hazel
         tree, Pomaderris apetala]
    2: the fine-grained wood of a hazelnut tree (genus Corylus) and
       the hazel tree (Australian genus Pomaderris)
    3: any of several shrubs or small trees of the genus Corylus
       bearing edible nuts enclosed in a leafy husk [syn:
       hazelnut, hazel, hazelnut tree]
    4: a shade of brown that is yellowish or reddish; it is a
       greenish shade of brown when used to describe the color of
       someone's eyes