dipole

[dahy-pohl]
noun
1.
Physics, Electricity. a pair of electric point charges or magnetic poles of equal magnitude and opposite signs, separated by an infinitesimal distance.
2.
Physical Chemistry. a polar molecule.
3.
Also called dipole antenna. Radio, Television. an antenna of a transmitter or receiving set consisting of two equal rods extending in opposite direction from the connection to the lead-in wire.

Origin:
1910–15; di-1 + pole2

dipolar, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
dipole (ˈdaɪˌpəʊl)
 
n
1.  two electric charges or magnetic poles that have equal magnitudes but opposite signs and are separated by a small distance
2.  a molecule in which the centre of positive charge does not coincide with the centre of negative charge
3.  Also called: dipole aerial a directional radio or television aerial consisting of two equal lengths of metal wire or rods, with a connecting wire fixed between them in the form of a T
 
di'polar
 
adj

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Dictionary.com's 21st Century Lexicon
Main Entry:  dipole
Part of Speech:  n
Definition:  See polar molecule
Dictionary.com's 21st Century Lexicon
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American Heritage
Science Dictionary
dipole   (dī'pōl')  Pronunciation Key 
  1. A pair of electric charges or magnetic poles, of equal magnitude but of opposite sign or polarity, separated by a small distance.

  2. A molecule having two such charges or poles.

  3. An antenna consisting of two rods of equal length extending outward in a straight line. Dipole antennas are usually used for frequencies below 30 megahertz.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Microwaves heat water because they are resonant with lots of tightly spaced
  vibrational modes of the molecule's dipole moment.
All but one of the dipole wire elements in a television aerial, for example,
  are parasitic.
Yes it is the exact same thing except for the fact that it may be a dipole
  system instead of a single coil and a secondary.
Description of plans for a dedicated experiment to measure the muon electric
  dipole moment.
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