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The definition of fiend

4 Definitions of: fiend

    1. noun, an evil spirit; demon; devil
    2. noun, a person who is extremely wicked, esp in being very cruel or brutal
    3. noun, a) a person who is intensely interested in or fond of something b) an addict
    4. noun, a mischievous or spiteful person, esp a child
    5. Show me some examples of this word: fiend
    6. Show me the etymology of the word: fiend

From Collins