labially การใช้

On the dorsal surface of the dentary there is an interdental ridge that separates successive teeth labially.
In the fourth cusp, the ridge hardly extends posteriorly, but rather labially, forming the posterior margin of the tooth and joining a ridge descending from the last labial cusp.
This would appear to mean that is a more-or-less typical labio-velar approximant in most situations, with an unrounded semi-fricative allophone, approximately, before the vowel, though possibly a labially compressed velar in that environment.