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UFO

noun
🔊/ˌjuː ef ˈəʊ/, 🔊/ˈjuːfəʊ/
🔊/ˌjuː ef ˈəʊ/, 🔊/ˈjuːfəʊ/
(also ufo)
(plural UFOs, ufos)
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  1. a strange object that some people claim to have seen in the sky and believe is a spacecraft from another planet (the abbreviation for ‘unidentified flying object’) 不明飞行物，幽浮（全写为 Unidentified Flying Object）compare flying saucerTopics Spacec1
    Oxford Collocations DictionaryUFO is used before these nouns:
    • sighting
    See full entry
    Word Origin1950s: acronym from unidentified flying object.