A bilabial consonant uses the two lips to form its principal constriction. The term specifies place of articulation; it leaves manner of articulation and voicing to be stated separately. The lower lip approaches the upper lip rather than the upper teeth.[ref]
The sounds [p], [b] and [m] share a bilabial closure. The first two are oral stops, while [m] permits nasal airflow; their shared lip position therefore does not determine whether sustained sound is possible during closure. A mirror provides direct evidence of the lip configuration, but it cannot alone establish the state of the vocal folds or the soft palate.

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