- risorius
[risorius 词源字典] - "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", Mid 18th cent.; 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 (from rīs-, past participial stem of rīdēre to laugh + -or) + -ius, suffix forming adjectives.[risorius etymology, risorius origin, 英语词源]
