| Terms for subject Environment (7657 entries) |
| ultrafiltration (Separation of colloidal or very fine solid materials by filtration through microporous or semipermeable mediums) | ultrafiltrimine | |
| ultrasound (Sound waves having a frequency above about 20,000 hertz) | ultraheli | |
| ultraviolet radiation (The part of the electromagnetic spectrum with wavelengths shorter than light but longer than x-rays; in the range of 4-400 nm) | ultraviolettkiirgus | |
| UNCED | UNSED | |
| uncontrolled dump (Place where waste is left on the ground and not buried in a hole) | ulaprügila | |
| uncontrolled dump (Place where waste is left on the ground and not buried in a hole) | hooldamata prügila | |
| underground biomass | maa-alune biomass | |
| underground disposal (The discharge, dumping or emission of wastes below the surface of the soil) | kõrvaldamine maa alla | |
| underground dump (Any subterranean or below-ground site in which solid, or other, waste is deposited without environmental controls) | allmaaprügila | |
| underground quarry (Quarry located below the surface of the earth) | allmaakivimurd | |
| underground railway (An electric passenger railway operated in underground tunnels) | allmaaraudtee | |
| underground railway (An electric passenger railway operated in underground tunnels) | metroo | |
| underground storage (Storage located underground designed to hold gasoline or other petroleum products or chemical solutions) | allmaahoidla | |
| underground storage | maa-alune hoidla | |
| underground train (A train for transportation of people, mostly beneath the surface of the ground, in order to lessen the traffic) | metroorong | |
| underprivileged people (A segment of the population that does not have access to the rights or benefits granted to the rest of society, often because of low economic or social status) | piiratud õigustega inimesed | |
| undertaking business (Any commercial activity, position or site associated with the preparation of the dead for burial and the management and arrangement of funerals) | ettevõtlus | |
| underwater outlet (Point of water disposal located below the sea surface) | allveelase | |
| unemployment (The condition of being without remunerative employment) | töötus | |
| unemployment (The condition of being without remunerative employment) | tööpuudus |