Flying saucer (library)
WordNet

noun


(1)   An (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins
WiktionaryText

Noun



  1. An unidentified flying object; UFO; usually with disc-like properties.
    Some connect the recent spate of flying saucer sightings with a rumored top-secret military aviation project.
  2. In fiction, an alien interplanetary vessel with a disc-like shape and generally metallic appearance.
 
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