| macrostomia | Greatly exaggerated width of the mouth, resulting from failure of union of the maxillary and mandibular processes, with extension of the oral orifice toward the ear. The defect may be unilateral or bilateral. (12 Dec 1998) |
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| macula flava | A yellowish spot at the anterior extremity of the rima glottidis where the two vocal folds join. (05 Mar 2000) |
| medulla ossium flava | Bone marrow in which the meshes of the reticular network are filled with fat. Synonym: medulla ossium flava. (05 Mar 2000) |
| Neisseria flava | A species found in the mucous membranes of the human respiratory tract; easily confused with Neisseria meningitidis. Synonym: Neisseria subflava. (05 Mar 2000) |