boundary/'baʊndərɪ/

n. the line that divides two areas of land

n. 〖复-ries/-rɪz/〗 [C] 边界，分界线：[boundary between sth¹ and sth²] The river forms a natural boundary between the two provinces. 这条河形成了这两个省的天然分界线。

构词bound¹ + -ary

同缀 dictionary; library; salary; summary; vocabulary

辨析border; boundary; frontier