Definition of synthesizer noun from the Oxford Advanced American Dictionary

 

synthesizer

 noun
noun
NAmE//ˈsɪnθəˌsaɪzər//
 
(informal synth)
 
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an electronic machine for producing different sounds. Synthesizers are used as musical instruments, especially for copying the sounds of other instruments, and for copying speech sounds. a speech synthesizer compare keyboard
See the Oxford Advanced Learner's Dictionary entry: synthesizer