| Terms for subject Environment (23897 entries) |
| radon (A radioactive gaseous element emitted naturally from rocks and minerals where radioactive elements are present. It is released in non-coal mines, e.g. tin, iron, fluorspar, uranium. Radon is an alpha particle emitter as are its decay products and has been indicted as a cause of excessive occurrence of lung cancer in uranium miners. Concern has been expressed at radon levels in some housing usually adjacent to granite rocks or old tin mining regions) | radão | |
| rag (Discarded textile waste, either post-consumer waste or pre-consumer waste, such as manufacturing process scraps) | desperdícios | |
| rag | desperdícios | |
| rag | trapo | |
| rag and bone man | farrapeiro | |
| rail traffic (The movement and circulation of vehicles transporting goods and people on railroad systems) | tráfego ferroviário | |
| rail transport (Transportation of goods and persons by railway) | transporte ferroviário | |
| railroad vehicle | vagões | |
| railroad vehicle | veículo rodoferroviário | |
| rails | frangos-d'água | |
| railway (A permanent track composed of a line of parallel metal rails fixed to sleepers, for transport of passengers and goods in trains) | caminhos de ferro | |
| railway | caminhos de ferro | |
| railway line | linha férrea | |
| railway network (The whole system of railway distribution in a country) | redes ferroviárias | |
| railway network | redes ferroviárias | |
| railway station (A place along a route or line at which a train stops to pick up or let off passengers or goods, especially with ancillary buildings and services) | estações ferroviárias | |
| railway station | estação de comboios | |
| railway station | estações ferroviárias | |
| rain (Precipitation in the form of liquid water drops with diameters greater than 0.5 millimeter) | chuva | |
| rain | chuva |