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

 

queer

 noun
noun
BrE BrE//kwɪə(r)//
 
; NAmE NAmE//kwɪr//
 
 
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(taboo, slang) an offensive word for a homosexual, especially a man, which is, however, also used by some homosexuals about themselves Word Origin early 16th cent.: considered to be from German quer ‘oblique, perverse’, but the origin is doubtful.
See the Oxford Advanced American Dictionary entry: queer