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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun obsidian has 1 sense
CIDE DICTIONARY
obsidian, n. [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]
OXFORD DICTIONARY
obsidian, n. a dark glassy volcanic rock formed from hardened lava.
Etymology
L obsidianus, error for obsianus f. Obsius, the name (in Pliny) of the discoverer of a similar stone