/ˈsemisɜ:kl ||; ˈsɛmɪˌsɝkḷ/noun [C] one half of a circle; something that is arranged in this shape 半圆；半圆形（的东西）: I want you all to sit in a semicircle. 我要你们大家围坐成半圆形 ☞picture at circle 见circle插图 ➔semicircular /ˌsemiˈsɜ:kjələ(r) ||; ˌsɛməˈsɝkjəlɚ/ adj