The cathedral's cycloidal arches created a mesmerizing pattern of light and shadow across the nave.

Comparative anatomists examined fossilized hyoid arches to trace the evolution of feeding mechanisms.

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.

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

The research team published a paper describing the unique membrane lipids found in archeal species isolated from deep-sea vents.

Scientists discovered several new strains of archebacteria thriving in the acidic hot springs.

The scientist isolated an archebacterium from the hot spring and began sequencing its genome.

During the Archean, Earth's crust cooled enough to host the earliest stable continents.

The Archean cratons preserve some of the oldest continental crust on Earth.