Webster's English Dictionary

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arch

1. arch \'a:rch\ n [ME arche, fr. OF, fr. (assumed) VL arca, fr. L arcus - 
   mor]e at ARROW 1: a typically curved structural member spanning an opening 
   and serving as a support (as for the wall or other weight above the 
   opening) 2a: something resembling an arch in form or function; esp : either 
    of two vaulted portions of the bony structure of the foot that impart 
   elasticity to it 2b: a curvature having the form of an arch  3: ARCHWAY 
2. arch vt 1: to cover or provide with an arch  2: to form or bend into an 
   arch  1: to form an arch  2: to take an arch-shaped course 
3. arch aj [arch-] [arch- (as in archrogue)] 1: PRINCIPAL, CHIEF {an 
   arch-villain}  2a: cleverly sly and alert  2b: playfully saucy