单词	obsidian
释义	obsidianobsidian /əbˈsɪdiən/ noun [uncountable] Etymology ETYMOLOGYobsidian Origin: 1300-1400 Latin obsidianus lapis, mistake for obsianus lapis stone of Obsius, a Roman traveler said to have discovered the rock a type of dark rock which looks like glass
随便看	meaningless meaninglessness meanly meanness means mean-spirited means test means-tested means testing meant meantime meanwhile meany measles measly measurable measurably measure measured measureless measurement measure of central tendency measure of spread measures of center measures of variation

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