| MHI | malignant histiocytosis of intestine; Mental Health Index; Mental Health Inventory |
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| MI | first meiotic metaphase; maturation index; medical illustrator; medical informatics; medical inspect... |
| MMR | mass miniature radiography; masseter muscle rigidity; maternal mortality rate; measles-mumps-rubella... |
| AICA | Anterior Inferior Cerebellar Artery; Hemifacial Spasm |
| AIIS | Anterior Inferior Iliac Spine |
| superior labial vein | <anatomy, vein> Veins taking blood from the upper lip and discharging into the facial vein. Synonym: vena labialis superior. (05 Mar 2000) |
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| labial | <dentistry> The tooth surface next to your lips or things mounted on the tooth surfaces next to your lips. (08 Jan 1998) |
| labial arch | An orthodontic arch wire that approximates the labial surfaces of the teeth. (05 Mar 2000) |
| labial bar | A major connector located labial to the dental arch joining two or more bilateral parts of a mandibular removable partial denture. (05 Mar 2000) |
| labial commissure | Junction of upper and lower lip which occurs at corner of mouth. See: angle of mouth. (05 Mar 2000) |
| labial embrasure | A space existing on the facial aspect of the interproximal contact area between adjacent anterior teeth. (05 Mar 2000) |
| labial flange | The portion of the flange of a denture which occupies the labial vestibule of the mouth. (05 Mar 2000) |
| labial gingiva | That portion of the gingiva that covers the labial surfaces of the teeth and the alveolar process. (05 Mar 2000) |
| labial glands | Mucous glands in the submucous tissue of the lips. Synonym: glandulae labiales. (05 Mar 2000) |
| labial hernia | Hernia through the canal of Nuck. (05 Mar 2000) |
| labial occlusion | Malposition of a tooth in a labial direction, the occlusion as seen from the labial side of the arches. (05 Mar 2000) |
| labial part of orbicularis oris muscle | <anatomy> The major part of the orbicularis oris muscle within the body of the lips. Synonym: pars labialis musculi orbicularis oris. (05 Mar 2000) |
| labial splint | An appliance of plastic, metal, or in combination, made to conform to the outer aspect of the dental arch and used in the management of jaw and facial injuries. (05 Mar 2000) |
| labial sulcus | A furrow between the developing lip and gum. Synonym: labiodental sulcus, lip sulcus, primary labial groove. (05 Mar 2000) |
| labial surface | The surface of a tooth that faces the buccal or labial mucosa of vestibule of the mouth; opposite to the lingual surface of tooth. Synonym: facies vestibularis dentis, facies facialis dentis, buccal surface, facial surface of tooth, facies buccalis, facies labialis, labial surface. (05 Mar 2000) |