Definition of liar noun from the Oxford Advanced Learner's Dictionary

 

liar

 noun
noun
BrE BrE//ˈlaɪə(r)//
 
; NAmE NAmE//ˈlaɪər//
 
 
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a person who tells lies Shelley wasn’t a very good liar (= did not find it easy to tell lies). Word Origin Old English lēogere (from lie2 and -ar).Extra examples He’s the biggest liar I’ve ever known. She’s an accomplished liar—they believed every word she said. You little liar—I never said that!
See the Oxford Advanced American Dictionary entry: liar