18-letter words containing a, c, i, d, h
- strathclyde region — a former local government region in W Scotland: formed in 1975 from Glasgow, Renfrewshire, Lanarkshire, Buteshire, Dunbartonshire, and parts of Argyllshire, Ayrshire, and Stirlingshire; replaced in 1996 by the council areas of Glasgow, Renfrewshire, East Renfrewshire, Inverclyde, North Lanarkshire, South Lanarkshire, Argyll and Bute, East Dunbartonshire, West Dunbartonshire, North Ayrshire, South Ayrshire, and East Ayrshire
- submarine sandwich — a sandwich made with a long cylindrical bread roll
- sulfuric anhydride — sulfur trioxide.
- swedish gymnastics — a system of passive and active exercising of muscles and joints
- the american dream — the notion that the American social, economic, and political system makes success possible for every individual
- the dark continent — a term for Africa when it was relatively unexplored
- the dismal science — a name for economics coined by Thomas Carlyle
- the-dark-continent — Africa: so called, especially during the 19th century, because little was known about it.
- theodore gericault — (Jean Louis André) Théodore [zhahn lwee ahn-drey tey-aw-dawr] /ʒɑ̃ lwi ɑ̃ˈdreɪ teɪ ɔˈdɔr/ (Show IPA), 1791–1824, French painter.
- thioantimonic acid — a hypothetical acid, H3SbS4, known only in the form of its salts
- thioarsenious acid — any of a group of hypothetical acids, H3AsS3, HAsS2, and H4As2S5, known only in the forms of their salts
- thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
- threatened species — a species likely, in the near future, to become an endangered species within all or much of its range.
- to pick and choose — If you pick and choose, you carefully choose only things that you really want and reject the others.
- triphosphoric acid — the hypothetical acid H 5 P 3 O 10 , known chiefly by its salts.
- vectorcardiography — a method of determining the direction and magnitude of the electrical forces of the heart.
- watchdog committee — a committee responsible for monitoring standards of behaviour
- welland ship canal — a ship canal in S Canada, in Ontario, connecting Lakes Erie and Ontario: 8 locks. 25 miles (40 km) long.
- white-faced hornet — any large, stinging paper wasp of the family Vespidae, as Vespa crabro (giant hornet) introduced into the U.S. from Europe, or Vespula maculata (bald-faced hornet or white-faced hornet) of North America.
- widemouth blindcat — any of several catfishes, as Satan eurystomus (widemouth blindcat) of Texas, that inhabit underground streams and have undeveloped eyes and unpigmented skin.
- world championship — an international competition in a particular sport or activity for people all around the world