from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A spherulitic cavity, often with concentric chambers, observed in some volcanic rocks, such as rhyolitic lavas.
from the GNU version of the Collaborative International Dictionary of English
- n. A spherulitic cavity often with concentric chambers, observed in some volcanic rocks, as in rhyolitic lavas. It is supposed to be produced by expanding gas, whence the name.
from The Century Dictionary and Cyclopedia
- n. Same as lithophysa.
Ancient Greek (Wiktionary)