semicircle/ˈsemɪsɜ:kl; `sɛmɪˌsəkl/ nhalf of a circle or of its circumference; thing arranged like this 半圆形; 半圆形的周长; 半圆形的东西 a semicircle of chairs 排列成半圆形的椅子 sitting in a semicircle round the fire 围著火坐成半圈. => illus at circle 见 circle 插图.
牛津英汉双解词典