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In architecture, the latin term opus ("work") is a word that generically indicates various techniques of constructing buildings that were in use in ancient Rome. Usually, the word opus is not used alone in building descriptions, but is paired with specific attributes whose purpose is to show precisely the building technique that was used (i.e., opus craticum, opus gallicum, opus incertum, opus isodomum, opus latericium, opus mixtum, opus reticulatum, opus vittatum, etc.).
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