voyeur
(French)
n a person who obtains sexual pleasure or excitement from the observation of someone undressing, having intercourse, etc.
(C20: French, literally: one who sees, from voir to see, from Latin videre)
♦
voyeurism n
♦
voyeuristic adj
♦
voyeuristically adv
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"