masturbation

[mas-ter-bey-shuh n]
noun
  1. the stimulation or manipulation of one's own genitals, especially to orgasm; sexual self-gratification.
  2. the stimulation, by manual or other means exclusive of coitus, of another's genitals, especially to orgasm.

Origin of masturbation

First recorded in 1760–70; masturbate + -ion
Related formsmas·tur·ba·tion·al, adjectivemas·tur·ba·to·ry [mas-ter-buh-tawr-ee, -tohr-ee] /ˈmæs tər bəˌtɔr i, -ˌtoʊr i/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for masturbation
n.

1711 (earlier as mastupration, 1620s), from French masturbation and directly from Modern Latin masturbationem (nominative masturbatio), noun of action from past participle stem of Latin masturbari "to masturbate." The long-standing speculation is that this Latin word is altered (probably by influence of turbare "to stir up") from *manstuprare, from manu, ablative of manus "hand" (see manual) + stuprare "defile" (oneself), from stuprum "defilement, dishonor," related to stupere "to be stunned, stupefied" (see stupid). But perhaps the first element represents an unattested *mazdo- "penis" [OED]. An earlier technical word for this was Onanism. Related: Masturbational.

Online Etymology Dictionary, © 2010 Douglas Harper

masturbation in Medicine

masturbation

[măs′tər-bāshən]
n.
  1. Excitation of one's own or another's genital organs, usually to orgasm, by manual contact or means other than sexual intercourse.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.