::First things first.

According to the Longman Pocket English Dictionary (1986) a synthesizer is defined as "An extremely versatile electronic musical instrument that produces a sound that can be altered in many ways (e.g., to mimic other instruments) and is usually played by means of a keyboard".
Source: http://members.lycos.co.uk/mark_mather/synths.html

Now what was that for huh? -_-