Learn how to say Sphinxes correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word sphinx:
1 (Sphinx) Greek Mythology a winged monster of Thebes, having a woman’s head and a lion’s body. It propounded a riddle about the three ages of man, killing those who failed to solve it, until Oedipus was successful, whereupon the Sphinx committed suicide.
an ancient Egyptian stone figure having a lion’s body and a human or animal head, especially the huge statue near the Pyramids at Giza.
an enigmatic or inscrutable person:
it drove him mad when she turned herself into a sphinx as a ruse to avoid facing the truth
2North American term for hawkmoth.
late Middle English: via Latin from Greek Sphinx, apparently from sphingein ‘draw tight’
Remember that sphinx is spelled with sph- at the beginning.