semicircle 英 [ semis :kl] 美 [ semis :rkl]n.半圆形，半圆形的周长，半圆形的东西例句：They are sitting in a semicircle.他们围成半圆形坐着。The village was formed of semicircle huts.这个村庄是由半圆形的茅舍构成的。