According to TermWiki.com, a nectarine is a fruit, related to the peach and without fuzz. They can be red, yellow or white.
Definition and photos of nectarines can be see here:
http://termwiki.com/EN:nectarine
No, Nectarines are smooth skinned, it is peaches and apricots that have a fuzzy skin.
Nectarines are believed to have originated in China, where they have been cultivated for thousands of years. They are a genetic mutation of peaches, belonging to the same species, Prunus persica. The smooth skin of nectarines distinguishes them from their fuzzy-skinned relatives. Today, they are grown in various countries around the world, including the United States, Spain, and Italy.