- a hole made, as in wood, by a worm, termite, etc.
- a hypothetical space-time tunnel or channel connecting a black hole with another universe, with a white hole, etc.
- A hole made by a burrowing worm.
- Physics A theoretical distortion of space-time in a region of the universe that would link one location or time with another, through a path that is shorter in distance or duration than would otherwise be expected.
- Einstein-Rosen bridge