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An exposed, oxidized portion of a mineral vein, especially a rust-colored outcrop of iron ore.
[Cornish gossen, from gōs, blood, from Old Cornish guit.]
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.
(Mining & Quarrying) an oxidized portion of a mineral vein in rock
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
gos•san(ˈgɒs ən, ˈgɒz-)
a rust-colored, oxidized deposit along an exposed iron-bearing vein.
[1770–80; orig. dial. (Cornwall) < Cornish, derivative of gōs blood; akin to Welsh gwaed]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.