(f) significa que un sustantivo es de género femenino (p. ej. la mujer, la luna).
(F)
The barber gave him the haircut for free after he accidentally shaved his sideburns.El peluquero le regaló el corte de pelo después de afeitarle las patillas accidentalmente.
The man was elegantly dressed, and his hair and beard had just been barbered.El hombre iba elegantemente vestido, y su pelo y su barba estaban recién cortados.