Hypertext Webster Gateway: "rhyolite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Rhyolite \Rhy"o*lite\, n. [Gr. "rei^n to flow + -lite.] (Min.)
A quartzose trachyte, an igneous rock often showing a fluidal
structure. -- {Rhy`o*lit"ic},, a.
From WordNet (r) 1.7 (wn)
rhyolite
n : very acid volcanic rock
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