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	nuptial nuptials Nuremberg Trials, the Nureyev, Rudolf nurse nursemaid nurse practitioner nursery nurseryman nursery rhyme nursery school nursing nursing home nursing mother nurturance nurturant nurture nut nutcase nutcracker nuthouse nutmeg nutraceutical nutrient nutrient cycle

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