syn ‧ the ‧ size BrE AmE ( also synthesise British English ) /ˈsɪnθəsaɪz, ˈsɪnθɪsaɪz/ verb [transitive]
1 . to make something by combining different things or substances:
DDT is a pesticide that was first synthesized in 1874.
2 . to combine separate things into a complete whole
3 . to produce sounds, speech, or music electronically