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From Ancient Greek συντρῑ́βω (suntrī́bō, “to rub together”) + -ation.
Etymology from Wiktionary, CC BY-SA 4.0.
syntribation
syn·tri·ba·tionToday it means: A form of (usually female) masturbation involving the rubbing or squeezing of the thighs together to sexually stimulate one's genitalia, often to the point of orgasm, typically without the use of hands. Full definition →