DuckCorp Dico

Found 2 definitions

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
    [news2]  [nf06]  井 /(en)tʃˈaɪniːz(ja)lˈe̞tə/,  [news2]  [nf06] い /ˈi/
   (noun (common) (futsuumeishi))
   well
   
                   
                 

2.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
   井 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, せい /sˈe̞i/
   1. (noun (common) (futsuumeishi))
   井桁
            Note: obscure termwell curb
   2. 二十八宿, 朱雀・すざく・2 [astronomy, etc. term] Chinese "Well" constellation (one of the 28 mansions)