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	grounder ground floor ground forces ground glass groundhog Groundhog Day grounding groundless ground level groundnut ground plan ground rules groundskeeper ground squirrel ground staff ground state ground stroke groundswell groundwater groundwork ground zero group group dynamics groupie grouping

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