ETYM Latin masturbatus, p. p. of masturbari to practice onanism: cf. French masturbation.
Manual stimulation of the genital organs (of oneself or another) for sexual pleasure; SYN. onanism, self-abuse.
Erotic stimulation especially of one's own genital organs commonly resulting in orgasm and achieved by manual or other bodily contact exclusive of sexual intercourse, by instrumental manipulation, occasionally by sexual fantasies, or by various combinations of these agencies.