<p><strong>Noun:</strong></p><ul><li>An instrument for measuring inductance, consisting essentially of an inductor with two or more coils whose relative position may be changed to vary the inductance.</li><li>An instrument for indicating a change in a component of a magnetic field vector, especially one related to the earth's magnetic field.</li><li>An instrument that indicates the rate of climb or descent in aeronautics.</li></ul>