DuckCorp Dico

Found one definition

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
   嬰 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, えい /ˈe̞i/
   (noun (common) (futsuumeishi))
    (prefix)
   嬰ヘ長調 [music term] sharp