| Rh | any of a group of picornaviruses that are responsible for many upper respiratory infections |
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| Rh | large genus of epiphytic or lithophytic unarmed cacti with usually segmented stems and pendulous branches |
| Rh | Old World chameleons |
| Rh | a small family of rod-shaped bacteria |
| Rh | the type genus of Rhizobiaceae |
| Rh | any fungus now or formerly belonging to the form genus Rhizoctinia |
| Rh | disease caused by rhizoctinia or fungi of Pellicularia and Corticium |
| Rh | fungus causing a disease in potatoes characterized by black scurfy spots on the tubers |
| Rh | any of various slender filaments that function as roots in mosses and ferns and fungi etc |
| Rh | producing or possessing or resembling rhizomes |
| Rh | any of numerous begonias having prominent shaggy creeping stems or rhizomes |
| Rh | a horizontal plant stem with shoots above and roots below serving as a reproductive structure |