| TRO | a line of latitude about 23 degrees North of the equator |
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| TRO | a line of latitude about 23 degrees South of the equator |
| TRO | of weather or climate |
| TRO | (rhetoric) characterized by or of the nature of a trope or tropes |
| TRO | relating to or situated in or characteristic of the tropics (the region on either side of the equator) |
| TRO | the branch of medicine that deals with the diagnosis and treatment of diseases that are found most often in tropical regions |
| TRO | any of several tropical carnivorous shrubs or woody herbs of the genus Nepenthes |
| TRO | edible tropical and warm-water prawn |
| TRO | a tropical forest with heavy annual rainfall |
| TRO | leishmaniasis of the skin |
| TRO | a chronic disorder that occurs in tropical and nontropical forms and in both children and adults |
| TRO | the time for the earth to make one revolution around the sun, measured between two vernal equinoxes |