The story
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A pad worn on the inner surface of women's underpants, up against the vulva, during a low-flow 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. Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.