英语词汇“tourmaline”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	tourmaline
释义	Word Frequency tourmaline (ˈtʊəməˌliːn) noun any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery Derived forms tourmalinic (ˌtʊəməˈlɪnɪk) adjective Word origin C18: from German Turmalin, from Sinhalese toramalli carnelian
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