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Dictionary Suite
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magnetic moment the ratio that expresses the strength of a particular source of magnetic field. [2 definitions]
magnetic needle a thin magnetized bar of steel situated within an instrument, such as a compass, so that it indicates the direction of the earth's magnetic poles.
magnetic north the northern direction indicated by a magnetic needle, in line with the earth's magnetic pole but usu. not true north.
magnetic pickup a phonograph pickup in which vibrations of the stylus are received by a coil in a magnetic field and thus converted to electrical current.
magnetic pole either of the apparent poles of a permanent magnet, at which the lines of magnetic force seem to converge. [2 definitions]
magnetic recording the process or product of recording a series of electrical signals onto a magnetizable surface, esp. used for audio, visual, and computer data.
magnetic resonance imaging a non-invasive medical imaging technology using radio waves and powerful magnetic fields to make the interior of the human body visible in three dimensions and in real time.(abbrev.: MRI)
magnetics (used with a sing. verb) the branch of physics concerned with magnets and magnetism.
magnetic storm a temporary widespread disturbance of the earth's magnetic field, caused by unusual solar activity.
magnetic tape a plastic tape coated with magnetic iron oxide, used to store recorded material.
magnetic wire a thin wire made of a ferromagnetic alloy, used to store recorded material.
magnetism the qualities and properties associated with magnets; ability to attract. [3 definitions]
magnetite a black, naturally occurring oxide of iron that is attracted to magnets and is important commercially as a source of iron.
magnetize to cause to become a magnet. [2 definitions]
magneto a device for producing an electric current, consisting of a coil of wire that rotates within the force field of a permanent magnet.
magnetoelectric of, indicating, or relating to electricity produced by magnets or magnetic fields.
magnetohydrodynamics (used with a sing. verb) the branch of physics concerned with the behavior of electrically conductive fluids, such as ionized gas or molten metal, in a magnetic field.
magnetometer a device for determining the strength and direction of magnetic fields, esp. that of the earth.
magneton a unit used to express the magnetic moment of an atomic or subatomic particle.
magnetopause the outer limit of the area in which a planet's magnetic field is stronger than the interplanetary field.
magnetosphere a region between five hundred and several thousand miles above the earth's surface, in which charged particles are trapped by the earth's magnetic field.