The archaeologist carefully measured the pelvic arches of each skeleton to determine the population's average stature.

The workers carefully removed the old jack arches to inspect the lintels below.

A black-arched moth landed on the oak branch at dusk, its striking pattern warning predators away.

At dusk, dozens of black-arched moths fluttered around the porch light.

The cardiologist suspected aortic arch syndrome after noticing diminished pulses and uneven blood pressure between the patient's arms.