registered trademarkBrE /ˌredʒɪstəd ˈtreɪdmɑːk/ 🔊NAmE /ˌredʒɪstərd ˈtreɪdmɑːrk/ 🔊 noun (symbol ®) the sign or name of a product, etc. that is officially recorded and protected so that nobody else can use it 注册商标