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A trademark for: any of various varieties of nylon made from castor oil, typically used in protective coatings.
1950s. From French Rilsan, apparently from ri- (in ricin castor oil plant), with apparently arbitrary extension.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。