The clinic installed devices that emit derma rays to accelerate healing.

The researchers detected unexpected levels of Becquerel rays near the contaminated site.

Photographers gathered on the ridge to capture the anticrepuscular rays stretching across the eastern sky.

A school of cownose rays swept through the shallow bay, uncovering clams as they fed.

In the darkened laboratory, cathode rays traced eerie green paths across the glass tube.

At night, electric rays glide along the ocean floor, startling divers with sudden shocks.

The lens was designed to correct aberrations for off-axis meridional rays to improve image sharpness.

The museum's exhibit warned that the ancient device still emitted occasional death-rays.

The technician used Roentgen-rays to capture detailed images of the damaged pipe.

The physicist's claim that the sample emitted N-rays caused a heated debate at the conference.