plural of heat-ray

(science fiction) A weapon that fires a beam of extremely high temperature.

plural of devil ray

Any of the rays of the genus Mobula, especially Mobula birostris, the manta ray.

A stream of beta particles (fast-moving electrons propagating through a gas or vacuum), such as emitted by a radioactive substance.

Synonym of glimmer of hope

plural of beta ray

plural of anticrepuscular ray

A meteorological optical phenomenon similar to a crepuscular ray, but appearing opposite the Sun in the sky.

plural of raying room