Real Dictionary

hazel
colour: Hazel eyes are greenish-brown in colour.
variable noun: A hazel is a small tree which produces nuts that you can eat.

Hazel in American English
a feminine name
any of a genus (Corylus) of shrubs or trees of the birch family, bearing edible nuts
of the hazel tree or its wood
noun: a female given name
noun: any shrub or small tree belonging to the genus Corylus, of the birch family, having toothed, ovate leaves and bearing edible nuts, as C. avellana, of Europe, or C. americana and C. cornuta, of the Western Hemisphere

hazel in British English
noun: any of several shrubs or small trees of the N temperate genus Corylus, esp C. avellana, having oval serrated leaves and edible rounded brown nuts: family Corylaceae