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n. A pad worn on the inner surface of women's underwear, up against the vulva, during a shoulder-day of the menstrual period, designed to absorb small, spotty quantities of menstrual fluid, in contrast to a tampon or sanitary napkin, worn on heavy-flow days.

"I dunno what you're seeing when you look at that "cross", but I'm seeing an unexplainably brown pantyliner."

pantalones   

panty shield