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A basic rock whose pockmarked appearance is caused by the presence of numerous white, rounded, embedded spherules.
var′i·o·lit′ic (-lĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) any basic igneous rock containing rounded bodies (varioles) consisting of radiating crystal fibres
[C18: from variola, referring to the pockmarked appearance of the rock]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014