Definify.com
Webster 1913 Edition
Trona
Tro′na
,Noun.
[Of Egyptian or North African origin.]
(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
.