Definition of sarcasm noun from the Oxford Advanced American Dictionary

 

sarcasm

 noun
noun
NAmE//ˈsɑrkæzəm//
 
[uncountable]
 
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a way of using words that are the opposite of what you mean in order to be unpleasant to someone or to make fun of them “That will be useful,” she snapped with heavy sarcasm (= she really thought it would not be useful at all). a hint/touch/trace of sarcasm in his voice
See the Oxford Advanced Learner's Dictionary entry: sarcasm