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Roman citadel
Answer for the clue "Roman citadel ", 3 letters:
arx
Word definitions for arx in dictionaries
Wikipedia
Word definitions in Wikipedia
ARX was an unreleased Mach-like operating system written in Modula-2+ developed by Acorn Computers Ltd in the Acorn Research Centre (ARC) UK and later Olivetti Research Center and later on Software Technology Laboratory (when Olivetti bought out Acorn) ...