13-letter words containing s, p, i, l, t
- unplasticized — not made plastic, as by the addition of a plasticizer
- unspeculative — not characterized by speculation
- unspiritually — in an unspiritual manner
- unsusceptible — not susceptible or impressionable; not possible or easy to influence; not vulnerable (to harm)
- uprighteously — in an upright or moral manner
- vanity plates — a vehicle license plate bearing a combination of letters or numbers requested by the licensee, as a name or occupation.
- vinyl plastic — any of various plastics made from polymerized vinyl compounds or copolymers of vinyl and other resins, used in various molded or extruded products, coatings, adhesives, sizes, etc.
- vivisepulture — the burying of something while still alive
- volute spring — a coil spring, conical in shape, extending in the direction of the axis of the coil.
- walter piston — Walter, 1894–1976, U.S. composer.
- water spaniel — either of two breeds of spaniels, used for retrieving waterfowl.
- with pleasure — gladly, willingly
- xiphiplastral — pertaining to or comprising a xiphiplastron
- xiphiplastron — the fourth lateral plate of a turtle's plastron
- zinc sulphate — a colourless soluble crystalline substance usually existing as the heptahydrate or monohydrate: used as a mordant, in preserving wood and skins, and in the electrodeposition of zinc. Formula: ZnSO4