Meaning

noun a compound made artificially by chemical reactions

adjective not of natural origin; prepared or made artificially

adjective involving or of the nature of synthesis (combining separate elements to form a coherent whole) as opposed to analysis; - P.S.Welch

originFrom French synthétique, from Ancient Greek συνθετικός (sunthetikós); Equivalent to synthesis + -ic (suffix formation of -tic).

Etymology from Wiktionary, CC BY-SA 3.0