= Labiodental consonant
A <labiodental consonant> forms its principal constriction between the lower lip and upper teeth. This is a <place of articulation>, distinct from the two-lip constriction of a <bilabial consonant>. It does not by itself specify <voicing> or <manner of articulation>.<Essentials of Linguistics (2nd edition) by Catherine Anderson and others>[§3.3, labiodental place of articulation]{ref}
The familiar sounds `[f]` and `[v]` are labiodental <fricatives>. Comparing them keeps the constriction location similar while changing the usual <voicing> category. Comparing `[f]` with `[p]` instead changes both the contact surface and the airflow mechanism. A mirror can show lower-lip contact with the upper teeth, while <acoustic phonetics> examines the resulting noise and periodicity.
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