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Orsha

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• Orsini

  /Italian orˈsiːni/ noun 1. an Italian aristocratic family that was prominent in Rome from the 12th to the 18th century

• Orsk

  [awrsk] /ɔrsk/ noun 1. a city in the S Russian Federation in Europe, on the Ural River. /Russian ɔrsk/ noun 1. a city in W Russia, on the Ural River: a major railway and industrial centre, with an oil refinery linked by pipeline with the Emba field (on the Caspian). Pop: 247 000 (2005 est)

• Or so

  Approximately, especially alluding to a number, as in Four hundred or so guests are invited. [ Late 1500s ]

• Orson

  [awr-suh n] /ˈɔr sən/ noun 1. a male given name: from an Old French word meaning “bearlike.”. masc. proper name, from French ourson, diminutive of ours “bear,” from Latin ursus (see Arctic).

• O-r system

  oxidation reduction system

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