/ Dictionary / Index E expander: Meaning and Definition of Find definitions for: ex•pand•er Pronunciation: (ik-span'dur), [key] — n. a person or thing that expands. 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. expanded plastic expanding universe Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language