From The Collaborative International Dictionary of English v.0.48 [gcide]:
Lithophyse \Lith"o*physe\, noun [Litho- + Gr. ? a flatus, air bubble.] (Min.) 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.
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