Quiz: Remember the definition of mal de mer?
1590s, "hole made by a burrowing insect" (in fruit, etc.), from worm (n.) + hole (n.). Astrophysics sense is attested from 1957.
A hole made by a burrowing worm.
A theoretical distortion of space-time that would link points in space through a second set of paths, some of which could be shorter than the shortest path without the wormhole. It is not known whether workholes are possible. See more at space-time.
A fast-moving ground ball in baseball, golf, etc