[ oh-nuh-niz-uh m ]
/ ˈoʊ nəˌnɪz əm /


withdrawal of the penis in sexual intercourse so that ejaculation takes place outside the vagina; coitus interruptus.

Nearby words

  1. on-the-spot,
  2. on-trend,
  3. ona,
  4. onager,
  5. onagraceous,
  6. onassis,
  7. onassis, aristotle socrates,
  8. onassis, jacqueline kennedy,
  9. onbeat,
  10. onboard

Origin of onanism

1720–30; after Onan, son of Judah (Gen. 38:9); see -ism

Related formso·nan·ist, nouno·nan·is·tic, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for onanist


/ (ˈəʊnəˌnɪzəm) /


Derived Formsonanist, noun, adjectiveonanistic, adjective

Word Origin for onanism

C18: after Onan, son of Judah; see Genesis 38:9

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for onanist



"masturbation," also "coitus interruptus," 1727, from Onan, son of Judah (Gen. xxxviii:9), who spilled his seed on the ground rather than impregnate his dead brother's wife: "And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother." The moral of this verse was redirected by those who sought to suppress masturbation.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for onanist


[ ōnə-nĭz′əm ]


coitus interruptus

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.