Relating to the mesial and lingual surfaces of a tooth; denoting especially the angle formed by their junction. ... (05 Mar 2000) ... 
(me″ze-o-ling´gwәl) pertaining to or formed by the mesial and lingual surfaces of a tooth, or the mesial and lingual walls of a tooth cavity preparation.
Type: Term Pronunciation: mē′zē-ō-ling′gwăl Definitions: 1. Relating to the mesial and lingual surfaces of a tooth; denoting especially the angle formed by their junction.
mesiolingual A reference to or formed by the mesial and lingual surfaces of a tooth, or the mesial and lingual walls of a tooth cavity preparation.