unidentified flying object
noun
plural unidentified flying objects
: a mysterious flying object in the sky that is sometimes assumed to be a spaceship from another planet : UFO
Three unidentified flying objects shot down from North American airspace could turn out to be balloons used for research or commercial purposes that posed no direct threat to the U.S., a White House spokesman said Tuesday.—Candy Woodall et al.
called also UAP, unidentified aerial phenomenon, unidentified anomalous phenomenon
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Merriam-Webster unabridged
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