Webster's English Dictionary

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arc

1. arc \'a:rk\ n [ME ark, fr. MF arc bow, fr. L arcus bow, arch, arc - 
   more]at ARROW 1: the apparent path described above and below the horizon by 
   the sun or ot her celestial body 2: something arched or curved; esp : a 
   sustained luminous discharge  of electricity gap in a circuit or between 
   electrodes 3: a continuous portion of a circle or other curve 
2. arc vi 1: to form an electric arc  2: to follow an arc-shaped course 
3. arc aj [arc sine arc or angle (corresponding to the) sine (of so many 
   degrees)] : INVERSE {~ sine}