(f) means that a noun is feminine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Leonte's wheezing breath made his doctor think that he had a respiratory infection.La respiración ruidosa de Leonte le hizo pensar al doctor que tenía una infección respiratoria.