masturbation Look up masturbation at Dictionary.com
1766, from Mod.L. masturbationem, from L. masturbatus, pp. of masturbari, altered (probably by influence of turbare "to stir up") from *manstuprare, from manu, abl. of manus "hand" (see manual) + stuprare "defile" (oneself), from stuprum "defilement, dishonor," related to stupere "to be stunned, stupefied" (see stupid). Earlier Onanism (q.v.). The verb masturbate is first recorded 1857.