nounpl. fly·bys also fly-bys
A flight passing close to a specified target or position, especially a maneuver in which a spacecraft or satellite passes sufficiently close to a body to make detailed observations without orbiting or landing.
- A flight past a celestial object in order to make observations.
- The upcoming flyby of Halley's comet is expected to provide new information on the nature of the comet.
- (US) A low-level flight of ceremonial nature, typically in connection with an airshow or a military parade.
- A brief visit to an IRC channel