synthesizesyn·the·size /ˈsɪnθɪsaɪz/ (also synthesise British EnglishBrE) verb [transitiveT] to produce something by combining different things, especially to create something that is similar to a natural productResearchers first synthesized the anti-depressant drug in 1972.
The technique may allow scientists to synthesize large diamonds more cheaply than they can be mined.
—synthesized adjectiveadj [only before a noun]Callers are already familiar with thesynthesised voice that replies to their questions.