noun, masculine/ˈpjoxo/plural: piojos
piojo is masculine in Spanish.
a louse, a cootie (a kind of parasitic insect, lice)
“Todavía está en la edad en que cree que las chicas tienen piojos.” — He's still at the age where he thinks girls have cooties.
Related: despiojar, piojento, piojo de mar, piojoso
Inherited from Old Spanish pioio, from Late Latin peduclus < peduculus, variant of Latin pēdīculus, from pēdis, from Proto-Indo-European *pezd-. Compare Portuguese piolho. Doublet of pedículo.