tandem bicycle(n = noun.artifact) bicycle-built-for-two, tandem - a bicycle with two sets of pedals and two seats;
is a kind of bicycle, bike, cycle, wheel

bicycle, bicycle chain, bicycle clip, bicycle pump, bicycle race, bicycle rack, bicycle seat, bicycle traffic, bicycle wheel, in tandem, ordinary bicycle, safety bicycle, tandem, tandem cart, tandem engine, tandem system, tandem trailer