The definition of dandy is something that is excellent.(adjective)
When you are having a good day, this is an example of a time when you are feeling dandy.
Dandy is defined as a very well-dressed, well-mannered man.(noun)
An example of a dandy is a man wearing a suit, shirt, tie, polished shoes and a hat.
See dandy in Webster's New World College Dictionary
noun pl. dandies
Origin: < ? playful Scot form of Andy < Andrew: see merry-andrew
See dandy in American Heritage Dictionary 4
noun pl. dan·dies
Origin: Perhaps short for jack-a-dandy, fop.
Learn more about dandy