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

 

sphinx

 noun
noun
BrE BrE//sfɪŋks//
 
; NAmE NAmE//sfɪŋks//
 
(also the Sphinx)
 
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an ancient Egyptian stone statue of a creature with a human head and the body of a lion lying down. In ancient Greek stories the Sphinx spoke in riddles. Word Origin late Middle English: via Latin from Greek Sphinx, apparently from sphingein ‘draw tight’.
See the Oxford Advanced American Dictionary entry: sphinx