(f) significa que un sustantivo es de género femenino (p. ej. la mujer, la luna).
(F)
It wasn't as though Allen thought his mother-in-law some sort of monstrous gorgon, but staying at her house for two weeks was more than he had in mind.No era que Allen considerara a su suegra una arpía monstruosa, pero dos semanas en su casa era más de lo que quería.