'Rhyolite' definitions:
Definition of 'rhyolite'
(from WordNet)
noun
Very acid volcanic rock
Definition of 'Rhyolite'
From: GCIDE
- 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. [1913 Webster]