The Collaborative International Dictionary
magnetic dipole \magnetic dipole\ n. A dipole with opposing magnetic poles.
WordNet
n. a dipole with opposing magnetic poles
Wikipedia
A magnetic dipole is the limit of either a closed loop of electric current or a pair of poles as the dimensions of the source are reduced to zero while keeping the magnetic moment constant. It is a magnetic analogue of the electric dipole, but the analogy is not complete. In particular, a magnetic monopole, the magnetic analogue of an electric charge, has never been observed. Moreover, one form of magnetic dipole moment is associated with a fundamental quantum property—the spin of elementary particles.
The magnetic field around any magnetic source looks increasingly like the field of a magnetic dipole as the distance from the source increases.
Usage examples of "magnetic dipole".
This ship was notably different from Jovian-system machines primarily because of its gleaming magnetic dipole core and its sporty outrider deflectors.
There's not much of a field now, of course, but three billion years ago the magnetic dipole field was pretty healthy around here.