unic - vert
- unicellular
- uniform development
- uniform flow
- uniformitarianism
- uniformity coefficient
- unilocular
- unimolecular reaction
- unit
- unit cell
- unit hydrograph
- unit weight
- universal stage
- unloading joint
- unoriented texture
- unsaturated flow
- unsaturated rock
- unsaturated solution
- unstable element
- unstable equilibrium
- unstable isotope
