triangularis
noun
tri·an·gu·la·ris
| \ trī-ˌaŋ-gyə-ˈlar-əs
\
\
plural triangulares\ -ˈlar-ˌēz
\
\
Medical Definition of triangularis
1
: a flat triangular muscle that extends from the base of the mandible to the angle formed by the joining of the upper and lower lips and that acts to depress this angle
2
: triquetral bone