self-stimulation
/ˈselfˌstɪmjʊˈleɪʃən/noun
mass noun
1
- used euphemistically to refer to masturbation〈婉〉手淫。
2
- Physiology a phenomenon which occurs in the hypothalamus and other areas of the brain, in which the propagation of electrical stimulation has positive reinforcing properties which act to maintain and perpetuate the impulses【生理】自我刺激。