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Search Result for "rhyolite": 
Wordnet 3.0

NOUN (1)

1. very acid volcanic rock;

The Collaborative International Dictionary of English v.0.48:

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]
WordNet (r) 3.0 (2006):

rhyolite n 1: very acid volcanic rock