synth /sɪnθ/noun 3verb 2adjective 1forms 3 noun3 •A musical synthesizer. •A synthetic humanoid, an android, a robot, a clone •(slang) A fictional reptilian android species. verb2 •(slang) To play on a musical synthesizer.There's some synthing, but mostly real strings and horns. And a remarkable acoustic piano solo, "Jacqueline," in memory of the modern sophisticated lady. — 1995 •Synonym of synthesize. adjective1 •Abbreviation of synthetic. formssynthed · synthing · synths