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phosphorous▼(of, relating to or containing trivalent phosphorus)adjective[UK: ˈfɒ.sfə.rəs] [US: ˈfɑː.sfə.rəs]
hypophosphorous▼(of or pertaining to hypophosphorous acid or its derivatives)adjective[UK: hˌaɪpəʊfˈɒsfərəs] [US: hˌaɪpoʊfˈɑːsfɚrəs]
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