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unidentified flying object

noun
1.
UFO.

UFO

[yoo-ef-oh or, sometimes, yoo-foh] /ˈyuˈɛfˈoʊ or, sometimes, ˈyu foʊ/
noun, plural UFO's, UFOs.
1.
any unexplained moving object observed in the sky, especially one assumed by some observers to be of extraterrestrial origin.
Also called unidentified flying object.
Compare flying saucer.
Origin of UFO
1950-1955
1950-55; u(nidentified) f(lying) o(bject)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unidentified flying object
Contemporary Examples
Historical Examples
  • People who reported seeing things got laughed at, mostly because they call any unidentified flying object a flying saucer.

    The Flying Stingaree Harold Leland Goodwin
British Dictionary definitions for unidentified flying object

UFO

/sometimes ˈjuːfəʊ/
abbreviation
1.
unidentified flying object
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unidentified flying object

UFO

n.

1953, abbreviation of Unidentified Flying Object, which is attested from 1950.

Online Etymology Dictionary, © 2010 Douglas Harper
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unidentified flying object in Culture
UFO [(yooh-ef-oh)]

An abbreviation for “Unidentified Flying Object.” Often described as “flying saucers,” some UFOs are believed to come from other planets or galaxies and thus support the idea that human beings are not the only form of intelligent life in the universe. Few scientists agree.

UFO [(yooh-ef-oh)]

The abbreviation for unidentified flying object. Sometimes referred to colloquially as “flying saucers.” Most UFO sightings have prosaic explanations; there is no hard evidence that extraterrestrial beings are visiting Earth.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Related Abbreviations for unidentified flying object

UFO

unidentified flying object
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Difficulty index for unidentified flying object

Few English speakers likely know this word

Word Value for unidentified

17
20
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