of, pertaining to, proceeding by, or involving synthesis ( opposed to analytic ).

noting or pertaining to compounds formed through a chemical process by human agency, as opposed to those of natural origin

synthetic vitamins; synthetic fiber.

(of a language) characterized by a relatively widespread use of affixes, rather than separate words, to express syntactic relationships

Latin is a synthetic language, while English is analytic. Compare analytic def. 3 polysynthetic def. 1

Also, synthetical. Logic . of or pertaining to a noncontradictory proposition in which the predicate is not included in, or entailed by, the subject.

not real or genuine; artificial; feigned

a synthetic chuckle at a poor joke.

Jewelry .

noting a gem mineral manufactured so as to be physically, chemically, and optically identical with the mineral as found in nature.

(not in technical use) noting a gem mineral manufactured and pigmented in imitation of a natural gemstone of that name.

something made by a synthetic, or chemical, process.

synthetics.

substances or products made by chemical synthesis, as plastics or artificial fibers.

the science or industry concerned with such products.

adjective

genuine , natural , real

adjective

constructed , counterfeit , ersatz * , fabricated , factitious , fake , false , hokey * , made , makeshift , manufactured , mock , phony , plastic , unnatural , artificial , manmade , imitation , simulated , contrived , ersatz , man-made , nylon , orlon , prepared