has part has part characteristic of inheres in has modifier Abnormal oral cavity morphology Abnormal oral frenulum morphology Abnormality of lingual frenum Abnormality of frenum of tongue Abnormality of oral frenula A frenulum is a small frenum. There are several frena that are usually present in a normal oral cavity, most notably the maxillary labial frenum, the mandibular labial frenum, and the lingual frenum. HP:0000190 An abnormality of the lingual frenulum, that is of the small fold of mucous membrane that attaches the tongue to the floor of the mouth, or the presence of accessory frenula in the oral cavity. Abnormality of oral frenum UMLS:C4025881 morphology abnormal frenulum of tongue