procerus
noun
pro·ce·rus
| \ prō-ˈsir-əs
\
\
plural proceri\ -ˌrī
\
or proceruses
\
or proceruses
Medical Definition of procerus
: a facial muscle that arises from the nasal bone and a cartilage in the side of the nose and that inserts into the skin of the forehead between the eyebrows