1) Artificial 2) Man-made 3) Not of natural origin 4) Prepared or made artificially 5) Synthetic 6) Unreal 1) Artificial 2) Synthetic 
produced by chemical manipulation of naturally occurring substances.
<chemistry> Produced by chemical manipulation of naturally occurring substances. ... (18 Nov 1997) ... 
(sem″e-sin-thet´ik) produced by chemical manipulation of naturally occurring substances.
Type: Term Pronunciation: sem′ē-sin-thet′ik Definitions: 1. Describing the process of synthesizing a particular chemical using a naturally occurring chemical as a starting material, thus obviating part of a total synthesis, the conversion of cholesterol (obtained from a natural source) into a corticosteroid.