18-letter words containing a, l, p, h, r, t
- preparatory school — a private or parochial secondary school, especially one boarding its students and providing a college-preparatory education.
- probability theory — the theory of analyzing and making statements concerning the probability of the occurrence of uncertain events. Compare probability (def 4).
- psychogalvanometer — a type of galvanometer for detecting and measuring psychogalvanic currents.
- pulp canal therapy — endodontics.
- repayment schedule — a document detailing the specific terms of a borrower's loan, such as monthly payment, interest rate, due dates etc
- root canal therapy — endodontics.
- salt of phosphorus — a colorless, odorless, crystalline, water-soluble solid, NaNH 4 HPO 4 ⋅4H 2 O, originally obtained from human urine: used as a blowpipe flux in testing metallic oxides.
- september holidays — a period of time in September when people do not have to go to school, college or work
- shatterproof glass — glass designed to resist shattering
- shepherd satellite — a small moon orbiting near a planetary ring, whose gravitational pull helps confine the ring and the ring's extent.
- specialist teacher — a teacher with expertise in working with children with special educational needs, such as dyslexia
- spectroheliography — the process of obtaining an image of the sun in light of a particular wavelength, such as calcium or hydrogen, showing the distribution of the element over the surface and in the solar atmosphere, using a spectroheliograph
- spherical geometry — the branch of geometry that deals with figures on spherical surfaces.
- spherical triangle — a triangle formed by arcs of great circles of a sphere.
- spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
- the general public — the people in a society; people in general
- the lords temporal — (in Britain) peers other than bishops in their capacity as members of the House of Lords
- the practicalities — the real facts or details of a situation, as opposed to its theoretical aspects
- the-cocktail-party — a play in verse (1950) by T. S. Eliot.
- thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
- thrills and spills — If you refer to thrills and spills, you are referring to an experience which is exciting and full of surprises.
- 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.
- to learn the ropes — If you are learning the ropes, you are learning how a particular task or job is done.
- to plough a furrow — If you say that someone ploughs a particular furrow or ploughs their own furrow, you mean that their activities or interests are different or isolated from those of other people.
- upper klamath lake — See under Klamath Lakes.
- upper palaeolithic — the latest of the three periods of the Palaeolithic, beginning about 40 000 bc and ending, in Europe, about 12 000 bc: characterized by the emergence of modern man, Homo sapiens
- withdrawal symptom — effects of stopping a drug