Some connect the recent spate of flying saucer sightings with a rumored top-secret military aviation project.
In fiction, an alien interplanetary vessel with a disc-like shape and generally metallic appearance
A flying saucer is a round, flat object which some people say they have seen in the sky and which they believe to be a spacecraft from another planet. Any of various unidentified flying objects of presumed extraterrestrial origin, typically described as luminous moving disks. a large round spacecraft from somewhere else in space, that some people believe they have seen in the sky UFO
an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins
flying disk-shaped object alleged to be extraterrestrial, unidentified flying object, UFO