23-letter words containing a, b, c, o, u
- turn-and-bank indicator — bank-and-turn indicator.
- unincorporated business — a privately owned business, often owned by one person who has unlimited liability as the business is not legally registered as a company
- urban conservation area — an urban area that is protected, preserved and carefully managed
- vestibulocochlear nerve — either one of the eight pairs of cranial nerves that supply the cochlea and semicircular canals of the internal ear and contribute to the sense of hearing
- water off a duck's back — any of numerous wild or domesticated web-footed swimming birds of the family Anatidae, especially of the genus Anas and allied genera, characterized by abroad, flat bill, short legs, and depressed body.