Cite
 

Meaning of expander

ex•pand•er

Pronunciation: (ik-span'dur), [key]
— n.
  1. a person or thing that expands.
  2. a transducer that produces an output with a range of voltages greater than that of the input signal. Cf. compressor (def. 5).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.