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expander

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪkˈspændə/US:USA pronunciation: respellingUSA pronunciation: respelling(ik span′dər)

ex•pand•er (ik span′dər),USA pronunciation n.

a person or thing that expands.
Electronicsa transducer that produces an output with a range of voltages greater than that of the input signal. Cf. compressor (def. 5).

expand + -er¹ 1860–65

Collins Concise English Dictionary © HarperCollins Publishers::

expander /ɪkˈspændə/ n

a device for exercising and developing the muscles of the body
an electronic device for increasing the variations in signal amplitude in a transmission system according to a specified law
Compare compressor

'expander' also found in these entries (note: many are not synonyms or translations):

compressor - compander

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⇱ expander - WordReference.com Dictionary of English

expander