1.  hazel(n = noun.plant) hazel tree, pomaderris apetala - Australian tree grown especially for ornament and its fine-grained wood and bearing edible nuts;

2.  hazel(n = noun.plant) - the fine-grained wood of a hazelnut tree (genus Corylus) and the hazel tree (Australian genus Pomaderris);

3.  hazel(n = noun.plant) hazelnut, hazelnut tree - any of several shrubs or small trees of the genus Corylus bearing edible nuts enclosed in a leafy husk;

4.  hazel(n = noun.attribute) - 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;
Derived form adjective hazel₁

   hazel(s = adj.all) - of a light brown or yellowish brown color;
Derived form noun hazel₄

1.  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]

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

2.  Of a light brown color, like the hazelnut. Shak. [1913 Webster]

hazel, n.
1 any shrub or small tree of the genus Corylus, esp. C. avellana bearing round brown edible nuts.
2 a wood from the hazel. b a stick made of this.
3 a reddish-brown or greenish-brown colour (esp. of the eyes).

Idiom:
hazel-grouse a woodland grouse, Tetrastes bonasia.

Etymology:
OE h{aelig}sel f. Gmc