A tongue disease characterized by an unusually short, thick lingual frenulum, a membrane connecting the underside of the tongue to the floor of the mouth. [ http://purl.obolibrary.org/obo/ECO_0007645 http://purl.obolibrary.org/obo/ECO_0007638 url:https://www.ncbi.nlm.nih.gov/pubmed/18983637 url:https://www.ncbi.nlm.nih.gov/pubmed/5251442 url:https://en.wikipedia.org/wiki/Ankyloglossia ]