semicircleWiktionary 原文英美n.半圆形中文释义来自 ECDICT构词拆解semisemi-前缀circlecircle词干semi-half · partial, incomplete词源说明From semi- + circle.释义名词noun1A half of a circle.2A surveyor's instrument for measuring angles; a graphometer.3(soccer) An arc whose center is the penalty spot, extending from the top of the penalty area.动词verb