Synonyms for ufoˈyuˈɛfˈoʊ; sometimes ˈyu foʊ
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Princeton's WordNet
unidentified flying object, UFO, flying saucer(noun)
an (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins
Synonyms:
flying saucer, unidentified flying object
Wiktionary
UFO(noun)
A UFO.UFO(noun)
An alien spacecraft.
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"ufo." Synonyms.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.synonyms.net/synonym/ufo>.

