18-letter words containing s, p, a, g, h
- parathyroid glands — any of several small oval glands usually lying near or embedded in the thyroid gland.
- pemphigus vulgaris — a potentially fatal blistering skin disease, characterized by large blisters on the skin, mucous membranes of the mouth, genitals, intestines, etc, which eventually rupture and form painful denuded areas from which critical amounts of bodily protein, fluid, and blood may be lost
- phantasmagorically — having a fantastic or deceptive appearance, as something in a dream or created by the imagination.
- phase-shift keying — (communications) (PSK) A digital modulation scheme that conveys data by changing the phase of a carrier wave. The data can either determine the absolute phase relative to the unmodulated carrier or reference signal ("coherent phase-shift keying", CPSK) or the change in phase ("differential phase-shift keying", DPSK). The number of different phases used determines the amount of data that can be transmitted in each cycle. Each cycle can be considered to constitute one "symbol", e.g. with two possible phases, each cycle carries one bit. The more phases that are used, the less tollerant to noise the transmissions becomes. Alternatives to PSK are amplitude-shift keying (ASK) and frequency-shift keying (FSK).
- photochemical smog — air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, especially those in automobile exhaust.
- physical geography — the branch of geography concerned with natural features and phenomena of the earth's surface, as landforms, drainage features, climates, soils, and vegetation.
- pigmy hippopotamus — a related but smaller animal, Choeropsis liberiensis
- plains grasshopper — a large, destructive short-horned grasshopper, Brachystola magna, of the western U.S., marked by pinkish hind wings.
- positively charged — having a positive charge
- prerelease showing — a showing of a film before it goes on general release
- press photographer — a photographer who works for a newspaper, magazine, etc
- programmer's cheer — (humour) "Shift to the left! Shift to the right! Pop up, push down! Byte! Byte! Byte!" [Origin?]
- proprietary rights — rights of ownership
- psychogalvanometer — a type of galvanometer for detecting and measuring psychogalvanic currents.
- psychopathological — the science or study of mental disorders.
- psychopharmacology — the branch of pharmacology dealing with the psychological effects of drugs.
- psychosociological — psychological and sociological
- publishing company — a firm which publishes books
- punishment beating — a form of corporal punishment carried out by a paramilitary organization on a member of another sectarian organization, usually in Northern Ireland
- purchasing officer — the member of staff in an organization who is responsible for buying goods or products
- put heads together — the upper part of the body in humans, joined to the trunk by the neck, containing the brain, eyes, ears, nose, and mouth.
- pygmy hippopotamus — a small hippopotamus, Choeropsis liberiensis, of forests and swamps in western Africa.
- segmental phonemes — phonemes consisting of sound segments; hence, the vowel, consonant, and semivowel sounds of a language
- shape-note singing — a traditional style of a capella singing using shape-note notation.
- shatterproof glass — glass designed to resist shattering
- shipping container — a large, strong container, usually of metal, used to store goods in during shipment
- shunting operation — an operation in which rail coaches are manoeuvred
- sociopsychological — of, relating to, or characterized by interrelated social and psychological factors.
- something to spare — a surplus of something
- sound spectrograph — an electronic device for recording a sound spectogram.
- spaghetti junction — an interchange, usually between motorways, in which there are a large number of underpasses and overpasses and intersecting roads used by a large volume of high-speed traffic
- 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.
- stratigraphic trap — A stratigraphic trap is a rock formation that contains hydrocarbons and is sealed by other rock formations.
- sympathetic string — a thin wire string, as in various obsolete musical instruments, designed to vibrate sympathetically with the bowed or plucked strings to reinforce the sound.
- the middle passage — the journey across the Atlantic Ocean from the W coast of Africa to the Caribbean: the longest part of the journey of the slave ships sailing to the Caribbean or the Americas
- the passenger seat — the seat used by a passenger of a car, beside the driver
- to stop at nothing — If you say that someone will stop at nothing to get something, you are emphasizing that they are willing to do things that are extreme, wrong, or dangerous in order to get it.
- whispering gallery — a space or gallery beneath a dome or broad arch in which low sounds produced at any of certain points are clearly audible at certain other distant points.