Definition of onanism in English:

onanism

noun

formal
  • 1Masturbation.

  • 2Coitus interruptus.

Origin

Early 18th century: from French onanisme or modern Latin onanismus, from the name Onan (Gen. 38:9), who practised coitus interruptus.

Pronunciation:

onanism

/ˈəʊnənɪz(ə)m/