12-letter words containing a, l, s, t, o
- smallclothes — men's close-fitting knee breeches of the 18th and 19th centuries
- snaggletooth — a tooth growing out beyond or apart from others.
- snatch block — a fairlead having the form of a block that can be opened to receive the bight of a rope at any point along its length.
- snow crystal — a crystal of ice sufficiently heavy to fall from the atmosphere.
- socratically — of or relating to Socrates or his philosophy, followers, etc., or to the Socratic method.
- soft landing — space vehicle
- soft release — a means of gradually accustoming wild animals to a new environment before releasing them into it
- softheadedly — in a soft-headed manner
- solar system — the sun together with all the planets and other bodies that revolve around it.
- sole legatee — the only person who receives a legacy
- solenogaster — any of a group of wormlike mollusks, class Solenogastres (formerly Aplacophora), inhabiting deep ocean layers and having fine limy spicules on the covering mantle.
- solicitation — the act of soliciting.
- solidaristic — relating to solidarism
- solitariness — alone; without companions; unattended: a solitary passer-by.
- solitary bee — any of numerous bees, as the leaf-cutting bees, that do not live in a community.
- solonization — the formation of solonetzic soil
- solstitially — in a solstitial manner
- solway firth — an arm of the Irish Sea between SW Scotland and NW England. 38 miles (61 km) long.
- somatic cell — one of the cells that take part in the formation of the body, becoming differentiated into the various tissues, organs, etc.
- somatopleure — the double layer formed by the association of the upper layer of the lateral plate of mesoderm with the overlying ectoderm, functioning in the formation of the body wall and amnion.
- somnambulant — to walk during sleep; sleepwalk.
- somnambulate — to walk during sleep; sleepwalk.
- somnambulist — sleepwalking.
- sorosilicate — any of the silicates in which each silicate tetrahedron shares one of its four oxygen atoms with a neighboring tetrahedron, the ratio of silicon to oxygen being two to seven.
- south hadley — a city in W Massachusetts.
- south island — the largest island of New Zealand. 58,093 sq. mi. (150,460 sq. km).
- south kvaløy — an island in the Arctic Ocean, off the N coast of Norway. Area: 735 sq km (284 sq miles)
- south platte — a river flowing NE from central Colorado to the Platte River in W Nebraska. 424 miles (683 km) long.
- special sort — a character, such as an accented letter, that is not a usual member of any font
- speciational — relating to speciation
- spectatorial — a person who looks on or watches; onlooker; observer.
- spermatocele — a swelling of the testicle
- sphacelation — the process of mortification
- spiflication — rough treatment
- spirochaetal — resulting from spirochaetes
- splenization — the transformation of something into a spleenlike tissue
- spongioblast — one of the primordial cells in the embryonic brain and spinal cord capable of developing into neuroglia.
- sportability — suitability to be used in or as a sport
- spotsylvania — a village in NE Virginia: the scene of Civil War battles between the armies of Grant and Lee, May 8–21, 1864.
- spotted tail — (Sinte-galeshka) 1833?–81, Brulé Sioux leader.
- stabilizator — a stabilizer
- stabilograph — an instrument for measuring body sway.
- staddlestone — (formerly) one of several supports for a hayrick, consisting of a truncated conical stone surmounted by a flat circular stone
- stakeholders — the holder of the stakes of a wager.
- stalactiform — resembling or shaped like a stalactite.
- stanley pool — a lake between the Democratic Republic of Congo and Congo-Brazzaville, formed by a widening of the River Congo. Area: 829 sq km (320 sq miles)
- state flower — a flower chosen as an official symbol of a U.S. state.
- state police — a police force under state authority rather than under the authority of a city or county in the state.
- state school — A state school is a school that is controlled and funded by the government or a local authority, and which children can attend without having to pay.
- stately home — a country mansion, usually of architectural interest and often open to the public.