late 14c., originally in reference to the sun's apparent motion in the sky, from Old French arc "bow, arch, vault" (12c.), from Latin arcus "a bow, arch," from PIE root *arku- "bowed, curved" (cognates: Gothic arhvazna "arrow," Old English earh, Old Norse ör; also, via notion of "supple, flexible," Greek arkeuthos, Latvian ercis "juniper," Russian rakita, Czech rokyta, Serbo-Croatian rakita "brittle willow"). Electrical sense is from 1821.
arc (v.)
1893, in the electrical sense, from arc (n.). Meaning "to move in an arc" attested by 1954. Related: Arced; arcing.
实用例句
1. A group of actors are rehearsing a play about Joan of Arc.
一群演员正在排演一出关于圣女贞德的戏。
来自柯林斯例句
2. Joan of Arc was finally canonized by Pope Benedict XV in 1920.
圣女贞德终于在1920年由教皇本尼狄克十五世封为圣徒。
来自柯林斯例句
3. His pass described a perfect arc through the leaden sky.
