The dictionary uses arch as an abbreviation for archaism, so readers know those words are obsolete.

The medieval poem included several arch. words that even scholars hesitated to interpret.

The conservatory's roof supported several intricate archings that cast patterned shadows across the marble floor.

Arch decided to spend the afternoon repairing his grandfather's pocket watch.

The geologists carefully photographed the arch dells before the rain altered their delicate formations.

Tourists paused to photograph the weathered triumphal arch that stood at the heart of the old boulevard.

The engineer inspected the oblique arch that allowed the bridge to cross the canal at an angle.

The director asked the lighting designer to focus a beam on the proscenium arch to highlight the actors as they entered.

Even after years of rivalry, she refused to forgive her arch enemy.

She inherited the title of arch dell and commanded respect among the traveling women who sold charms and told fortunes.