OBSIDIAN


Meaning of OBSIDIAN in English

[ob.sid.i.an] n [NL obsidianus, fr. L obsidianus lapis, false MS reading for obsianus lapis, lit., stone of Obsius, fr. Obsius, its supposed discoverer] (1796): a dark natural glass formed by the cooling of molten lava

Merriam-Webster English vocab.      Английский словарь Merriam Webster.