-ic

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• The Modern English adjectival suffix -ic was first seen as a suffix in English during the Middle English period. It was borrowed in words from Old French '-ique', which came from Latin '-icus', which came ultimately from Ancient Greek '-ικος (-ikos)'. There are some that contend that '-icus' was native to Latin and was cognate with rather than borrowed from Greek. At any rate, the suffix -icus was very wide-spread by the Classical Latin period in native words as well as in words derived from Greek.^{[citation needed]}
• It is also used in chemistry 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. See Inorganic nomenclature.