onion can make people cry but there's never been a
vegetable that can make people laugh.
~ Will Rogers
is a term which generally refers to an edible part
of a plant. The definition is traditional rather than
scientific and is somewhat arbitrary and subjective.
All parts of herbaceous plants eaten as food by humans,
whole or in part, are normally considered vegetables.
Mushrooms, though belonging to the biological kingdom
Fungi, are also commonly considered vegetables. In
general, vegetables are thought of as being savoury,
and not sweet, although there are many exceptions.
Nuts, grains, herbs, spices and culinary fruits are
normally not considered vegetables.
- the free encyclopedia)
further reading see http://en.wikipedia.org/wiki/Vegetables