OriginFrom Swedish trona or from Spanish trona, both derived from Arabic أَطْرُون (ʔaṭrūn), from نَطْرُون (naṭrūn), from Ancient Greek νίτρον (nítron), ultimately from Egyptian nṯrj: R9. Doublet of natron and niter.
- uncountableAn evaporite, consisting of mixture of sodium carbonate and sodium bicarbonate, Na₃HCO₃CO₃·2H₂O.
- A census-designated place in Inyo County, California, United States.