A curved symmetrical structure spanning an opening and typically supporting the weight of a bridge, roof, or wall above it. The ancient stone arch stood firm despite the passage of centuries.
A structure forming a curved top on a doorway, window, or other opening. The grand entrance was marked by a beautifully carved wooden arch.
The rainbow formed a perfect arch across the sky.
The raised curve on the bottom of the foot. She had to wear special shoes to support the arch of her foot.