Learn how to say Masturbate correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word masturbate:
stimulate one’s genitals with one’s hand for sexual pleasure:
we do not like to admit that we masturbate
[with object] stimulate the genitals of (someone) to give them sexual pleasure:
they masturbated each other in the long grass below the tennis courts
mid 19th century: from Latin masturbat- ‘masturbated’, from the verb masturbari, of unknown origin