Definition of -an in English:

-an

suffix

1Forming adjectives and nouns, especially from:
1.1Names of places: Cuban
1.2Names of systems: Anglican
1.3Names of zoological classes or orders: crustacean
1.4Names of founders: Lutheran
2 /an/ Chemistry Forming names of organic compounds, chiefly polysaccharides: dextran

Origin

from Latin -anus, -ana, -anum.

Definition of -an in:

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Word of the day anastrophe
Pronunciation: əˈnastrəfē
noun
the inversion of the usual order of words...