-ic
/ɪk/suffix
Elementary
1
Used to form adjectives from nouns with the meaning “of or pertaining to”.
2
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 (H₂SO₄) has more oxygen atoms per molecule than sulphurous acid (H₂SO₃).