18-letter words containing h, y, d, r, o, a
- pyrosulphuric acid — a fuming liquid acid made by adding sulphur trioxide to concentrated sulphuric acid. Formula: H2S2O7
- random walk theory — the theory that the future movement of share prices does not reflect past movements and therefore will not follow a discernible pattern
- ready when you are — If you say to someone 'Ready when you are', you are telling them that you are now ready to do something and that as soon as they are ready, you will do it.
- rheims-douay bible — Douay Bible.
- rhondda cynon taff — a county borough in S Wales, created from part of Mid Glamorgan in 1996. Pop: 231 600 (2003 est). Area: 558 sq km (215 sq miles)
- rhyming dictionary — a specialist dictionary organized by the final sounds of words, used to write poetry
- ride a hobby horse — an activity or interest pursued for pleasure or relaxation and not as a main occupation: Her hobbies include stamp-collecting and woodcarving.
- search-and-destroy — designed to find and destroy by bombing etc
- secondary syphilis — the second stage of syphilis, characterized by eruptions of the skin and mucous membrane.
- september holidays — a period of time in September when people do not have to go to school, college or work
- shaggy dog (story) — a long, rambling joke, typically involving ludicrously unreal or irrational behavior and usually having an irrelevant conclusion
- sound and the fury — a novel (1929) by William Faulkner.
- spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
- 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
- temporary hardness — hardness of water due to the presence of magnesium and calcium hydrogencarbonates, which can be precipitated as carbonates by boiling
- the same old story — the familiar or regular course of events
- to hold your peace — If you hold or keep your peace, you do not speak, even though there is something you want or ought to say.
- vectorcardiography — a method of determining the direction and magnitude of the electrical forces of the heart.
- water of hydration — the portion of a hydrate that is represented as, or can be expelled as, water: now usually regarded as being in true molecular combination with the other atoms of the compound, and not existing in the compound as water.
- withdrawal symptom — effects of stopping a drug