Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A brown, black, or green volcanic glass formed from basaltic magma and often found along the edges of dikes, sills or volcanic flows, where rock usually forms first by contact with the cooler surrounding rock.
from The Century Dictionary.
- noun A vitreous form of basalt; basalt-glass; a rock occurring frequently along the edges or selvages of dikes of basalt or other kinds of basic lava, but sometimes forming flows of considerable magnitude, as at Kilauea.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A vitreous form of basalt; -- so called because decomposable by acids and readily fusible.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology A black, vitreous
basalt ofvolcanic origin
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[German Tachylyt : Greek takhu-, tachy- + Greek lutos, soluble (from lūein, to loosen; see leu- in Indo-European roots).]
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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