flying saucer

Short definition from Wiktionary

Noun

1. 1
   A disc-shaped unidentified flying object or UFO; originally in reference to sightings by aviator Kenneth Arnold in Washington in 1947.
2. 2
   An alien interplanetary vessel, typically disc-shaped and of metallic construction.
3. 3
   A form of confectionery, a small spheroidal capsule of rice paper filled with sherbet.