syn‧the‧size (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

[TahlilGaran] Dictionary of Contemporary English ▲