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Definition of WAVEGUIDE
: a device (as a duct, coaxial cable, or glass fiber) designed to confine and direct the propagation of electromagnetic waves (as light); especially: a metal tube for channeling ultrahigh-frequency waves
: a device (as a glass fiber) designed to confine and direct the propagation of electromagnetic waves (as light) <use of waveguides for visual examination of the stomach>
Device that constrains the path of electromagnetic waves (seeelectromagnetic radiation). It can be used to transmit power or signals in the form of waves while minimizing power loss. Common examples are metallic tubes, coaxial cables, and optical fibres (seefibre optics). Waveguides transmit energy by propagating transmitted electromagnetic waves through the inside of a tube to a receiver at the other end. Metal waveguides are used in such technologies as microwave ovens, radar systems, radio relay systems, and radio telescopes.