Definition of risorius in English:

risorius

noun

Anatomy
  • More fully "risorius muscle". A flat muscle originating from the fascia of the masseter muscle and inserting into the corner of the mouth, which it draws laterally, as in smiling.

Origin

Mid 18th century; earliest use found in Philosophical Transactions of the Royal Society of London. From post-classical Latin risorius from post-classical Latin risorius ridiculous, laughing from classical Latin rīsor laugher + -ius, suffix forming adjectives.

Pronunciation

risorius

/rɪˈsɔːrɪəs//rɪˈzɔːrɪəs/