Pow·ys (pō'ĭs) Family of British writers, comprising the brothers John Cowper Powys (1872-1963), whose novels, such as Wolf Solent (1929), glorify nature; Theodore Francis Powys (1875-1953), who wrote allegorical novels, such as Mr. Weston's Good Wine (1927); and Llewelyn Powys (1884-1939), known primarily for his essays.