半円(はんえん) はんえん noun semicircle; half circle size 1. semicircle; half circle Half of a circle, or a shape resembling one. Used both as a geometric term and in everyday description of curved shapes and arrangements. 紙(かみ)を半円(はんえん)に切(き)った。🔊 I cut the paper into a semicircle. 子(こ)どもたちが半円(はんえん)の形(かたち)に並(なら)んだ。🔊 The children lined up in a half circle. 虹(にじ)はきれいな半円(はんえん)を描(えが)いて空(そら)にかかっていた。🔊 The rainbow hung in the sky, tracing a beautiful semicircle. 半(はん) (half) + 円(えん) (circle). The same 半(はん) gives 半分(はんぶん) (half) and 半年(はんとし) (half a year).Common collocations半円(はんえん)形(けい): semicircular in shape半円(はんえん)を描(えが)く: to trace a semicircle半円(はんえん)状(じょう)に並(なら)ぶ: to be arranged in a half circleSimilar words円(えん): circle — the full shape半径(はんけい): radius — a measurement, not a shape; 半(はん) here means half the diameter Related Words Related: 円(えん) Related: 円形(えんけい) Related: 半径(はんけい) general Added 2026.8.6 18:19 · Revised 2026.9.2 13:02 30000/30441_hanen