18-letter words containing u, n, d, e, f, a
- sulfuric anhydride — sulfur trioxide.
- sutton-in-ashfield — a market town in N central England, in W Nottinghamshire. Pop: 41 951 (2001)
- under the aegis of — guided or protected by
- wildlife sanctuary — an area where wild animals and plants are protected
- xenon hexafluoride — a colorless, crystalline compound, XeF 6 , that melts at 50°C to a yellow liquid, and boils at 75°C.