1. An (apparently) flying object whose nature is unknown; especially those considered to have extraterrestrial origins
   - unidentified flying object, flying saucer

Derived forms: UFOs

Type of: apparition, fantasm, phantasm, phantasma, phantom, shadow

Encyclopedia: UFO

• bicycle pump
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• bicycle seat
• bicycle traffic
• bicycle wheel
• bicycle-built-for-two
• bicycler
• bicyclic
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• bicyclist
• bicylindrical
• bid
• bid price
• Bida
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• biddy
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• Bidens
• Bidens bipinnata
• Bidens connata
• Bidens coronata