a steerable self-propelled airship
capable of being steered or directed
A lighter-than-air craft that can be steered and propelled through the air. From the French word dirigeable meaning steerable. (This term is generally considered out-of-date. The modern term is airship.)
A cigar-shaped aircraft that is filled with a gas that is lighter than air. The Goodyear Blimp is a small dirigible.
Dirigible is Frank Capra's 1931 adventure film about the competition to reach the South Pole between a French airship and U.S. naval fixed-wing pilots.