wave·guide

[weyv-gahyd]
noun Electronics, Optics.
a conduit, as a metal tube, coaxial cable, or strand of glass fibers, used as a conductor or directional transmitter for various kinds of electromagnetic waves.
Compare optical fiber.


Origin:
1930–35; wave + guide

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
waveguide (ˈweɪvˌɡaɪd) [Click for IPA pronunciation guide]
 
n
electronics a solid rod of dielectric or a hollow metal tube, usually of rectangular cross section, used as a path to guide microwaves

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Waveguide is always a great word to know.
So is flibbertigibbet. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
Example sentences
For light, the entangled photons can travel through a waveguide such as optical fiber and remain in superposition during transit.
The transmission line is terminated with a waveguide embedded in the medium of interest, in our case the stream channel.
The energy is then tapped and sent down a waveguide that is known as a coaxial cable to your television.
The elimination of polarization dependence of optical wavelength filters by using waveguide directional couplers.
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