bal·un

[bal-uhn]
noun Electricity.
a device for converting a balanced line into an unbalanced line and vice versa.
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Collins
World English Dictionary
balun (ˈbælən) [Click for IPA pronunciation guide]
 
n
electronics a device for coupling two electrical circuit elements, such as an aerial and its feeder cable, where one is balanced and the other is unbalanced
 
[C20: shortened from bal(anced to) un(balanced transformer)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Balun is always a great word to know.
So is interrobang. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
FOLDOC
Computing Dictionary

balun definition

electronics
A transformer connected between a balanced source or load and an unbalanced source or load. A balanced line has two conductors, with equal currents in opposite directions. The unbalanced line has just one conductor; the current in it returns via a common ground or earth path.
(1996-10-17)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The first balun provides common-mode rejection while the second is used in band-reject mode.
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