Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various volcanic glasses distinguished by their dull pitchlike luster.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a natural glass, that is rich in microscopic crystallites, formed by the rapid cooling of lava or magma

from the GNU version of the Collaborative International Dictionary of English

  • n. An igneous rock of semiglassy nature, having a luster like pitch.

from The Century Dictionary and Cyclopedia

  • n. An old volcanic rock, resembling hardened pitch in appearance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. dark acid granitic glass

Etymologies

Translation of German Pechstein.
(American Heritage® Dictionary of the English Language, Fourth Edition)
pitch +‎ stone (Wiktionary)

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