What is EDDY?

From the Merriam-Webster Online Dictionary:

• Main Entry: ¹ed·dy
• Pronunciation: \ˈe-dē\
• Function: noun
• Inflected Form(s): plural eddies
• Etymology: Middle English (Scots) ydy, probably from Old Norse itha
• Date: 15th century

1 a : a current of water or air running contrary to the main current; especially : a circular current : whirlpool b : something moving similarly
2 : a contrary or circular current (as of thought or policy)