名詞 arc:

1. electrical conduction through a gas in an applied electric field
   同義詞：discharge, spark, electric arc, electric discharge
2. a continuous portion of a circle
3. something curved in shape
   同義詞：bow

動詞 arc:

1. form an arch or curve
   同義詞：arch, curve

1. Joan of Arc was burnt (alive) at the stake.
   圣女貞德在火刑柱上被(活活)燒死。
2. The stick of carbon is often used in an electric arc lamp.
   碳精棒常用于電弧燈。
3. Joan of Arc was made a saint in 1920.
   1920年，貞德被追封為圣女。
4. Joan of Arc was one of France's greatest daughters.
   圣女貞德是法國最偉大的女性之一。
5. The sun appears to move in an arc across the sky.
   太陽看起來在天空以弧線運行。

arc

n.（名詞）
Something shaped like a curve or an arch:
拱形物：形狀類似曲線或拱的物體：
例句：
the vivid arc of a rainbow.
彩虹清晰的拱

Mathematics A segment of a circle.
【數(shù)學】 ?。簣A周的一段
Electricity A luminous discharge of current that is formed when a strong current jumps a gap in a circuit or between two electrodes.
【電學】 電弧，弧光：當強電流在回路裂縫或兩電極間躍升時形成的輝光放電
Astronomy The apparent path of a celestial body as it rises above and falls below the horizon.
【天文學】 周日弧，夜間?。禾祗w升起或落下地平線時的明顯路徑
v.intr.（不及物動詞）
arced 或 arcked [ôrkt] arc.ing 或 arck.ing [ôr.kng] arcs
To form an arc.
形成拱狀物
To move or seem to move in a curved path:
循弧線行進：在彎曲的路往上運動或好象在運動：
例句：
the stars that arc across the sky.
在天空中弧形運動的星

來源：
Middle English ark
中古英語 ark
from Old French arc
源自 古法語 arc
from Latin arcus
源自 拉丁語 arcus