Library / English Dictionary

    OBSIDIAN

    Pronunciation (US): Play  (GB): Play

     I. (noun) 

    Sense 1

    Meaning:

    Acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin piecesplay

    Classified under:

    Nouns denoting substances

    Hypernyms ("obsidian" is a kind of...):

    volcanic glass (a kind of natural glass produced when molten lava cools very rapidly)

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