Labiodental a. : Formed or pronounced by the cooperation of the lips and teeth, as f and v.

Labiodental n. : A labiodental sound or letter.

Example:
Why do people post Spanish in Latin language requests?

Taxonomy
labiodental, languages, Labiodental consonant, free encyclopedia, affricates, symphony, fricatives, IPA symbol, dialect, labial consonants, articulations, search, lower lip, upper teeth, the International, Orthography, hippos, chin.

Defination from the web:
labiodental sounds to occur phonemically are the fricatives and the approximant. ... Please note these differ from the German bilabial-labiodental affricate <pf> which commences with a bilabial p. All these affricates are rare sounds. ...