单词 | onyx |
释义 | Word Frequency onyx(ˈɒnɪks) noun 1. a variety of chalcedony with alternating black and white parallel bands, used as a gemstone. Formula: SiO2 2. a compact variety of calcite used as an ornamental stone; onyx marble. Formula: CaCO3 Word origin C13: from Latin from Greek: fingernail (so called from its veined appearance) |
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