synthetic in WordNet English dictionary

1. artificial as if portrayed in a film
   "a novel with flat celluloid characters"
   celluloid  synthetic 
   
2. not of natural origin; prepared or made artificially
   "man-made fibers"; "synthetic leather"
   man-made  semisynthetic  synthetic 
   
3. of a proposition whose truth value is determined by observation or facts
   "`all men are arrogant' is a synthetic proposition"
   synthetic  synthetical 
   
4. systematic combining of root and modifying elements into single words
   synthetic 
   
5. 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
   synthetic  synthetical 
   
6. not genuine or natural
   "counterfeit rhetoric that flourishes when passions are synthetic"- George Will
   synthetic 
   

1. a compound made artificially by chemical reactions
   synthetic  synthetic substance