Forming adjectives and some nouns.
[Greek -etikos or -ētikos.]
For example, cosmetic comes from Greek kosmētikos, from kosmos, order or adornment; antibiotic from anti- plus biōtikos, fit for life, from bios, life; narcotic from narkōtikos, from narkoun, make numb. Others similarly formed include aesthetic, apologetic, ascetic, athletic, diuretic, energetic, pathetic, prophetic, synthetic, and theoretic. Such adjectives often have corresponding nouns in -esis. See also -atic, -itic, -otic, and -ic.