Mathematics. the identity element of a group in which the operation is addition. (of a function, especially of a function of a complex variable) a point at which a given function, usually a function of a complex variable, has the value zero; a root.
Mucosa buccalis. The inner lining of the cheeks and lips, which is an anatomic region that includes all the mucous membrane lining of the inner surface of the cheeks and lips, from the line of contact of the opposing lips to the line of attachment of mucosa to the alveolar ridges and pterygomandibular raphe, which occupies an area of 50â60 cm2.
alÂ·veÂ·oÂ·loÂ·bucÂ·cal groove. Upper and lower portions of buccal vestibule on each side; portions between cheek and superior and inferior bursal gingivae, excluding portion of vestibule between cheek and teeth. Synonym(s): alveolobuccal sulcus, gingivobuccal groove, gingivobuccal sulcus.lÂ·veÂ·oÂ·loÂ·bucÂ·cal groove. the upper and lower portions of the buccal vestibule on each side; the portions between cheek and superior and inferior bursal gingivae, excluding the portion of the vestibule between cheek and teeth.