25-letter words containing a, h, r, d
- vertical redundancy check — (storage, communications) (VRC) An error checking method performed on one 8-bit ASCII character, where the 8th bit is used as the parity bit. The resulting parity bit is constructed by XORing the word. The result is a "1" if there is an odd number of 1s, and a "0" if there is an even number of 1s in the word. This method is unreliable because if an odd number of bits are distorted, the check will not detect the error. The Longitudinal Redundancy Check is an improvement.
- war of the grand alliance — the war (1689–97) in which England, the Netherlands, Spain, Sweden, and the Holy Roman Empire in league with Bavaria, Brandenburg, Savoy, and the Palatinate opposed France.
- what is sb/sth doing here — If you ask what someone or something is doing in a particular place, you are asking why they are there.
- white sands missile range — a U.S. Army military testing ground for rockets and guided missiles in SW New Mexico, W of Alamogordo.
- world health organization — an agency of the United Nations, established in 1948, concerned with improving the health of the world's people and preventing or controlling communicable diseases on a worldwide basis through various technical projects and programs. Abbreviation: WHO.