inductor

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that inducts, especially.
• noun A device that functions by or introduces inductance into an electric circuit.
• noun The chemical reactant that initiates or accelerates an induced reaction and is consumed in the process.

from The Century Dictionary.

• noun One who inducts; the person who inducts another into an office or charge.
• noun In electricity, any part of an instrument or apparatus which acts inductively on another or is so acted upon. See earth-inductor.
• noun Specifically:
• noun The revolving element of an inductor-alternator.
• noun An induction-coil.

from the GNU version of the Collaborative International Dictionary of English.

• noun The person who inducts another into an office or benefice.
• noun (Elec.) That portion of an electrical apparatus, in which is the inducing charge or current.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics a passive device that introduces inductance into an electrical circuit
• noun medicine an evocator or an organizer

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an electrical device (typically a conducting coil) that introduces inductance into a circuit