1. man-made, semisynthetic, synthetic -- (not of natural origin; prepared or made artificially; "man-made fibers"; "synthetic leather")
2. synthetic, synthetical -- (involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis; "limnology is essentially a synthetic science composed of elements...that extend well beyond the limits of biology"- P.S.Welch)
3. synthetic -- (systematic combining of root and modifying elements into single words)
4. synthetic, synthetical -- (of a proposition whose truth value is determined by observation or facts; "`all men are arrogant' is a synthetic proposition")
5. celluloid, synthetic -- (artificial as if portrayed in a film; "a novel with flat celluloid characters")
6. synthetic -- (not genuine or natural; "counterfeit rhetoric that flourishes when passions are synthetic"- George Will)
synthetic can be used as a noun
1. synthetic, synthetic substance -- (a compound made artificially by chemical reactions)
1.
What his dazzled state neglected in this, his first far too synthetic estimation, we do not think it necessary to point out here. - from Les Miserables by Victor Hugo