flu What is the Definition of flu?Noun:an acute febrile highly contagious viral disease Other meanings of flu (synonyms, cognates). ENRU flu грипп fluffy пушистый fluidity текучесть Frequently viewed: pen meaningdefinition of writedefinition of commercialcareful meaningaway meaningyarn meaninglack meaningopen definitionimpose definitiondefinition of admitinherit meaningbehind meaning A B C D E F G H I J K L M N O P Q R S T U V W X Y Z