a person or thing that synthesizes.
any of various electronic, sometimes portable consoles or modules, usually computerized, for creating, modifying, and combining tones or reproducing the sounds of musical instruments by controlling voltage patterns, operated by means of keyboards, joysticks, sliders, or knobs.

1865–70; 1905–10, for def 2; synthesize + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synthesizer (ˈsɪnθɪˌsaɪzə)
1.  an electrophonic instrument, usually operated by means of a keyboard and pedals, in which sounds are produced by voltage-controlled oscillators, filters, and amplifiers, with an envelope generator module that controls attack, decay, sustain, and release
2.  a person or thing that synthesizes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


machine that electronically generates and modifies sounds, frequently with the use of a digital computer. Synthesizers are used for the composition of electronic music and in live performance

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Unfortunately, it has a synthesizer instead of an accordion.
The researchers used the tones not as they were played for a recording or a
There are many special machines, such as the harmonic synthesizer which
  predicts the tides.
Better still, the app actually plays the song thanks to a built-in multi-track
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