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Meaning of trachybasalt

tra•chy•ba•salt

Pronunciation: (trā"kē-bu-sôlt', -bas'ôlt, -bā'sôlt, trak"ē-), [key]
— n.
  1. a fine-grained volcanic rock containing sanidine and calcic plagioclase.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.