an unidentified flying object: a strange object that flies through the sky that no one can recognize. Some people think UFOs are a sign of life on other planets.
Synonyms and related words
Science fiction
alien
alien
android
UFO
noun countable
US /ˌju ef ˈoʊ/
Word Forms
singular
UFO
plural
UFOs
DEFINITIONS1
1
an unidentified flying object: a strange object that flies through the sky that no one can recognize. Some people think UFOs are a sign of life on other planets.