From WordNet (r) 3.0 (2006):
arch
adj 1: (used of behavior or attitude) characteristic of those
who treat others with condescension [syn: arch,
condescending, patronizing, patronising]
2: expert in skulduggery; "an arch criminal"
3: naughtily or annoyingly playful; "teasing and worrying with
impish laughter"; "a wicked prank" [syn: arch, impish,
implike, mischievous, pixilated, prankish, puckish,
wicked]
n 1: a curved shape in the vertical plane that spans an opening
2: a curved bony structure supporting or enclosing organs
(especially the inner sides of the feet)
3: a passageway under a curved masonry construction; "they built
a triumphal arch to memorialize their victory" [syn: arch,
archway]
4: (architecture) a masonry construction (usually curved) for
spanning an opening and supporting the weight above it
v 1: form an arch or curve; "her back arches"; "her hips curve
nicely" [syn: arch, curve, arc]