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obsessive-compulsive disorder | obsessive-compulsive personality | obsessively | obsessiveness | obsessivity | obsidian | obsidional | obsigillation | obsign | obsignate | obsignation




obsidiann. [L. Obsidianus lapis, so named, according to Pliny, after one Obsidius, who discovered it in Ethiopia: cf. F. obsidiane, obsidienne. The later editions of Pliny read Obsianus lapis, and Obsius, instead of Obsidianus lapis, and Obsidius.].
     A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.  [1913 Webster]
    " In a thin section it often exhibits a fluidal structure, marked by the arrangement of microlites in the lines of the flow of the molten mass."  [1913 Webster]


obsidian, n. a dark glassy volcanic rock formed from hardened lava.

L obsidianus, error for obsianus f. Obsius, the name (in Pliny) of the discoverer of a similar stone

For further exploring for "obsidian" in Webster Dictionary Online

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