(noun & adj.) A phoneme pronounced using the lips, as in and. In labio-dental sounds, the upper incisors and lower lip meet. Labio-velar sounds occur when a sound is made at the velum (soft palate) and the lips are rounded st the same time ()
Referring to the lips, or labia. Generally refers explicitly to the mechanosensory specializations, as opposed to the chemosensory ( amphidial) specializations in the nose. These labial sensilla can be divided into two groups, the inner labials ( ILs) and the outer labials ( OLs), based upon their relative distance from opening of the buccal cavity. The cephalic sensilla ( CEPs) have endings grouped closely to the OLs in C. elegans (and thus might also be considered as labials), but lie away from the lips in some other nematode species. This term is also is used to refer to the two flaps which border the opening of the vulva; e.g. the vulval labia.