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Forming adjectives, and some nouns.

French ‑atique or Latin ‑aticus, often based on Greek ‑atikos.

Some of the many adjectives in this ending are dramatic (via late Latin from Greek dramatikos); rheumatic (Old French reumatique, or via Latin from Greek rheumatikos); pneumatic (French pneumatique or Latin pneumaticus, from Greek pneumatikos, from pneuma, wind). The ending also appears in adjectives formed from English nouns: operatic, acrobatic, lymphatic.

Some adjectives in ‑atic have become nouns as well, through a shorthand in which—for example—aquatic plant has been abbreviated to an aquatic, or in geology, an erratic boulder became an erratic, one thought to have been brought from a distance by glacial action. A few are as often nouns as they are adjectives: lunatic, fanatic.

For adjectives in ‑cratic, see ‑cracy.

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