Obsidian
[əb'sɪdɪən]
解释:
(noun.) acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces.
艾德琳校对--From WordNet
解释:
(n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.
加勒特录入
解释:
n. a natural glass—the vitreous condition of an acid lava.
手打:波莉