from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix Used to form adjectives from nouns with the meaning "of or pertaining to"; adjectival suffix appended to various words, often nouns, to make an adjective form. Often added to words of Latin origin, but used with other words also.
Combination of -ic French -ique, from Latin -icus, related to Ancient Greek suffix -ικός (-ikos), plus -al from Latin adjective suffix -alis, or French -el. (Wiktionary)