The Apennines or Apennine Mountains (; , ?a singular used in the plural;Apenninus has the form of an adjective, which would be segmented Apenn-inus, often used with nouns such as mons (mountain) or Greek oros (orogeny) but just as often used alone as a noun. The ancient Greeks and Romans typically but not always used "mountain" in the singular to mean one or a range; thus, "the Apennine mountain" refers to the entire chain and is translated "the Apennine mountains".
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