What is the meaning of hazel?

noun

• Australian tree grown especially for ornament and its fine-grained wood and bearing edible nuts.
  • synonyms: hazel tree, Pomaderris apetala
• The fine-grained wood of a hazelnut tree (genus Corylus) and the hazel tree (Australian genus Pomaderris. )
• Any of several shrubs or small trees of the genus Corylus bearing edible nuts enclosed in a leafy husk.
  • synonyms: hazelnut, hazelnut tree
• 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.

adjective

• Of a light brown or yellowish brown color. .