Definitions for onanismˈoʊ nəˌnɪz əm
Random House Webster's College Dictionary
o•nan•ismˈoʊ nəˌnɪz əm(n.)
withdrawal of the penis in sexual intercourse so that ejaculation takes place outside the vagina; coitus interruptus.
Ref: masturbation .
Origin of onanism:
1720–30; after Onan, son of Judah (Gen. 38:9); see -ism
manual stimulation of the genital organs (of yourself or another) for sexual pleasure
coitus interruptus, withdrawal method, withdrawal, pulling out, onanism(noun)
a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation
ejaculating outside the vagina during intercourse; (the performing of) coitus interruptus
Origin: From the biblical name Onan: In the Book of Genesis, Onan, son of Judah, in fulfillment of the laws of levirate marriage was to impregnate his brother Er's widow, Tamar, in order to raise offspring from the union in his brother's name. In order to avoid raising descendants for his late brother, however, Onan spilled his semen on the ground when he went in to his brother's wife, so that he would not give offspring to his brother. (Genesis 38:9). Thus the word Onanism was coined, meaning ejaculating outside the vagina, or masturbation (because this also spills semen, rather than using it for procreation).