WordReference Random House Unabridged Dictionary of American English © 2026
tro•na
(trō′nə),USA pronunciation n.
- Mineralogya monoclinic mineral, grayish or yellowish hydrous sodium carbonate and bicarbonate, Na2CO3·NaHCO3·2H2, occurring in dried or partly evaporated lake basins.
- dialect, dialectal Arabic ṭrōn, aphetic variant of naṭrūn natron
- Spanish
- 1790–1800