trona definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an impure type of hydrous sodium carbonate, NaCO·NaHCO·2HO, gray or yellowish-white, used as a source of sodium compounds
Origin: Swedish probably ; from colloquial Arabic ṭrōn, contr. ; from naṭrūn: see natron
trona definition by American Heritage Dictionary
A natural vitreous gray or white mineral, Na2CO3·NaHCO3·2H2O, used as a source of sodium compounds.
Origin: Swedish, probably from Arabic dialectal ṭrōn, variant of Arabic naṭrūn, natron; see natron.