1. An iced drink of wine or distilled liquor mixed with flavoring ingredients, something resembling or suggesting such a drink. Came from a bartender who mixed her drinks with rooster tail feathers. One night a man came in and asked for "One of those cock-tails", and thus the phrase was born.
2. A solution of agents taken together for medical treatment
1. James knew that if he had another cocktail, he would pass out right then and there.
2. James is only alive right now because he is on an AIDS cocktail.