Webster's English Dictionary

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eddy

ed.dy \'ed-e-\ n [ME (Sc dial.) ydy, prob. fr. ON itha; akin to OHG ith- 
   again], L et and 1a: a current of water or air running contrary to the main 
   current; esp)X : a small whirlpool 1b: a substance moving similarly  2: a 
   contrary or circular current  - eddy vb