plural of light rail

(US, Canada, rail transport) A kind of passenger railway in urban and suburban settings typically characterized by a mixture of tram (or in North America streetcar) and metro features, crossing streets at grade crossings and normally powered by electricity.

plural of leading light

(idiomatic) An acclaimed expert, one of the foremost experts, a luminary. / (nautical, navigation) A light that helps to guide vessels into a port.

plural of Christmas light

(Australia) A light bulb. / A nearly evacuated glass globe containing ionized gas (plasma), which produces lightning-like patterns when touched.

An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.

To illuminate; to make clear.

(astronomy) A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (10¹⁶ metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances.

(chemistry) Water in its standard form of H₂O, containing two protium hydrogen atoms, as opposed to heavy water.