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Concept
Bilabial consonant
Summary
In phonetics, a bilabial consonant is a labial consonant articulated with both lips.
Bilabial consonants are very common across languages. Only around 0.7% of the world's languages lack bilabial consonants altogether, including Tlingit, Chipewyan, Oneida, and Wichita.
The bilabial consonants identified by the International Phonetic Alphabet (IPA) are:
Owere Igbo has a six-way contrast among bilabial stops: [p ph ɓ̥ b b̤ ɓ].
The extensions to the IPA also define a ([ʬ]) for smacking the lips together. A lip-smack in the non-percussive sense of the lips noisily parting would be [ʬ↓].
The IPA chart shades out bilabial lateral consonants, which is sometimes read as indicating that such sounds are not possible. The fricatives [ɸ] and [β] are often lateral, but since no language makes a distinction for centrality, the allophony is not noticeable.
Official source
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