What is the meaning of -ic?

Used to form adjectives from nouns with the meaning “of or pertaining to”.

Used to denote certain chemical compounds in which a specified chemical element has a higher oxidation number than in the equivalent compound whose name ends in the suffix -ous. For example sulphuric acid (HSO₄) has more oxygen atoms per molecule than sulphurous acid (H₂SO₃).

-ic (of or pertaining to)

-ic

forms diminutive nouns

Alternative form of -ik

forms verbs

Forms adjectives with the meaning "of or pertaining to".

Source: wiktionary.org