brownfield
noun [ C ]
ENVIRONMENT uk/ˈbraʊnfiːld/ us( UK usually brownfield site)an area in a town or city that has been used in the past for factories or offices, and that could now be used for new building development:
Officials have identified 15 brownfields that take up 40 acres of land inside the city limits.
brownfield
adjective [ before noun ]
brownfield development/land/reclamation
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greenfield adjective