calzón

Etymology
Attested since the 14th century, as a surname. From.

Noun

 * 1)  breeches
 * 2)  underwear, underpants

Etymology
From. Compare 🇨🇬. .

Noun

 * 1) underpants
 * 2) female undergarment, panties, knickers

Usage notes

 * In Spain, it is generally used only in the plural.
 * In El Salvador, it is used as a regular countable noun meaning 'pair of panties', perfectly normally in the singular: Me compré un calzón nuevo 'I bought a new pair of panties (for myself)', Se te olvidó empacar esos tres calzones 'You forgot to pack those three pairs of panties'.