onanism

from WordNet (r) 3.0 (2006)

onanism
    n 1: manual stimulation of the genital organs (of yourself or
         another) for sexual pleasure [syn: {masturbation},
         {onanism}]
    2: a method of birth control in which coitus is initiated but
       the penis is deliberately withdrawn before ejaculation [syn:
       {coitus interruptus}, {withdrawal method}, {withdrawal},
       {pulling out}, {onanism}]

from The Collaborative International Dictionary of English v.0.48

Onanism \O"nan*ism\, n. [Onan (--Gen. xxxviii. 9): cf. F.
   onanisme.]
   Self-pollution; masturbation.
   [1913 Webster]