22-letter words containing a, n, d, r, u
- unidirectional current — direct current
- unilateral disarmament — disarmament, especially nuclear disarmament, carried out by one state on its own
- united empire loyalist — any of the American colonists who settled in Canada during or after the War of American Independence because of loyalty to the British Crown
- universal product code — a bar code that indicates price, product classification, etc., and can be read electronically, as at checkout counters in supermarkets. Abbreviation: UPC.
- unprofessional conduct — activity that is contrary to the accepted code of conduct of a profession
- unsaturated production — Unsaturated production is the production of smaller, unsaturated hydrocarbons from saturated hydrocarbons, for example producing alkenes such as ethane and propene.
- urban development zone — an area that is designated as being a site for urban development
- urban district council — a council of an urban district that, in conjunction with a county council, has responsibilities for local government issues
- van der waals equation — an equation of state relating the pressure, volume, and absolute temperature of a gas, taking into account the finite size of the molecules and the attractive force between them.
- wardour street english — affectedly archaic speech or writing
- water under the bridge — If you say that an event or incident is water under the bridge, you mean that it has happened and cannot now be changed, so there is no point in worrying about it any more.
- west greenland current — an ocean current flowing northward along the west coast of Greenland.
- world communion sunday — the first Sunday in October, during which members of ecumenical churches throughout the world celebrate Holy Communion, especially to affirm their unity in Christ.