- A body that has the property of attracting particles of iron, cobalt, nickel, or various other metallic alloys and that, when freely suspended, tends to assume a definite direction between the magnetic poles of the Earth (magnetic polarity).
- A bar or horseshoe-shaped piece of iron or steel that has been made magnetic by contact with another magnet or, as in an electromagnet, by passage of electric current around a metallic (iron) core.
- An electromagnet built in a cylindrical configuration to accommodate a patient in its core, for magnetic resonance imaging.
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Examples: glitazone, GI cocktail, etc.