A commuter rail system that combines aspects of an interurban railway with those of a subway, using a menagerie of pathways such as viaduct, tunnel, beam, cut and cover, trench, at grade, and others.

(chess) Chess played at a relatively quick time control, with each side getting about 15 minutes to make their moves.

Rapid movement of the eyes, characterising REM sleep

An Olympic shooting event, competed at 25 meter range.

plural of bus rapid transit

(transport) A form of rapid transit using buses, which have dedicated rights-of-way or laneways, purpose-built bus stations, and dedicated traffic signalling.

(engineering, euphemistic) An explosion or breakup of a vehicle, usually an airplane or a rocket.

plural of rapid unplanned disassembly

plural of rapid antigen test

(medicine) A fast-acting chromatographic immunoassay for the detection of specific antigens.