From Scottish Gaelic Grammar Wiki
A bilabial is a sound made using both lips.
- the bilabial sounds of English are [p, b, m]
- the bilabial sounds of Gaelic are [p, pʰ, m] represented by the spellings <b, p, m> respectively.
- Ladefoged, D. (2010) A Course in Phonetics. 6th Edition. Wadsworth Publishing.