Synthetical

adjective
1.
of, pertaining to, proceeding by, or involving synthesis (opposed to analytic).
2.
noting or pertaining to compounds formed through a chemical process by human agency, as opposed to those of natural origin:
synthetic vitamins; synthetic fiber.
3.
(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).
4.
Also, synthetical. Logic. of or relating to a noncontradictory proposition in which the predicate is not included in, or entailed by, the subject.
5.
not real or genuine; artificial; feigned:
a synthetic chuckle at a poor joke.
6.
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.

noun
7.
something made by a synthetic, or chemical, process.
8.
synthetics.

substances or products made by chemical synthesis, as plastics or artificial fibers.
the science or industry concerned with such products.

adjective
1.
(of a substance or material) made artificially by chemical reaction
2.
not genuine; insincere: synthetic compassion
3.
denoting languages, such as Latin, whose morphology is characterized by synthesis Compare polysynthetic, agglutinative (sense 2), analytic (sense 3)
4.
(philosophy)

(of a proposition) having a truth-value that is not determined solely by virtue of the meanings of the words, as in all men are arrogant
contingent Compare a posteriori, empirical

noun
5.
a synthetic substance or material

synthetic syn·thet·ic (sĭn-thět’ĭk)
adj.

Relating to or involving synthesis.

Produced by chemical synthesis, especially not of natural origin.

n.
A synthetic chemical compound or material.
synthetic
(sĭn-thět’ĭk)
Produced artificially, especially in a laboratory or other man-made environment. Nylon is a synthetic chemical compound.