lallation
/læˈleɪʃən/noun
mass noun
1- imperfect speech, especially the repetition of meaningless sounds by babies幼儿语（尤指婴儿的无意义重复）。
1.1
- the pronunciation of r as l.发音时把r音发成l音。
词源
mid 17th cent.: from Latin lallatio（n-）， from lallare 'sing a lullaby'.