unit - vesi
- unit cell
- unit matrix
- unit of heat
- unit operation
- unit process
- unit time
- unitary matrix
- univalent
- univariant system
- universal bridge
- universal constant
- universal developer
- universal gas constant
- universal indicator
- unpaired electron
- unsaponifiable matter
- unsaturated bond
- unsaturated compound
- unsaturated hydrocarbon
- unsaturated solution
