flying saucer

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an (apparently) flying object whose nature is unknown;
especially those considered to have extraterrestrial origins
• Syn:
unidentified flying object, UFO
• Hypernyms:
apparition, phantom, phantasm, phantasma, fantasm, shadow

• Từ đồng nghĩa / Synonyms:
  unidentified flying object, UFO