magnetic moment

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The product of the pole strength of a magnet and the distance between the poles.

Wiktionary

1. n. physics The torque exerted on a magnet within a magnetic field; a vector, being the product of the strength of the magnet and the distance between its poles.

GNU Webster's 1913

1. n. The torque exerted on a magnet or dipole when it is placed in a magnetic field.

WordNet 3.0

1. n. the torque exerted on a magnet or dipole when it is placed in a magnetic field