[ ju:ɛf'əʊ , 'ju:fəʊ ]
■ noun ( plural ~s ) a mysterious object seen in the sky for which it is claimed no orthodox scientific explanation can be found, popularly said to be vehicles carrying extraterrestrials.
Derivatives
ufological adjective
ufologist noun
ufology noun
Origin
1950s: acronym from unidentified flying object .