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Related to trona: borax
A natural vitreous gray or white mineral, Na2CO3·NaHCO3·2H2O, used as a source of sodium compounds.
[Swedish, probably from Arabic dialectal ṭrōn, variant of Arabic naṭrūn, natron; see natron.]
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.
(Minerals) a greyish mineral that consists of hydrated sodium carbonate and occurs in salt deposits. Formula: Na2CO3NaHCO3.2H2O
[C18: from Swedish, probably from Arabic natrūn natron]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a grayish or yellowish mineral, hydrous sodium acid carbonate, Na3H(CO)2∙2H2O, formed by evaporation in lake beds.
[1790–1800; < Sp < dial. Arabic ṭrōn, aph. variant of naṭrūn natron]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.