Webster's English Dictionary

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cocktail

1. cock.tail \'ka:k-.ta-l\ n [1cock + tail] 1: a horse with its tail docked 
    2: a horse not of pure breed 
2. cocktail n [prob. fr. 1cock + tail] 1: an iced drink of distilled liquor 
   mixed with flavoring ingredients  2: an appetizer (as tomato juice) served 
   as a first course at a meal 
3. cocktail aj : designed for semiformal wear {~ dress}