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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 tro·na /ˈtronə/

From: Webster's Revised Unabridged Dictionary (1913)

 Tro·na n.  Chem. & Min. A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.
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