18-letter words containing p, i, l, g, a
- 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.
- stepping-off place — jumping-off place (def 2).
- super giant slalom — a slalom race in which the course is longer and has more widely spaced gates than in a giant slalom.
- superciliary ridge — browridge.
- supraorbital ridge — browridge.
- surgical appliance — a specialized device used by somebody to relieve a particular medical condition
- the general public — the people in a society; people in general
- 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
- to scrape a living — If you say that someone scrapes a living or scratches a living, you mean that they manage to earn enough to live on, but it is very difficult. In American English, you say they scrape out a living or scratch out a living.
- unit magnetic pole — the unit of magnetic pole strength equal to the strength of a magnetic pole that repels a similar pole with a force of one dyne, the two poles being placed in a vacuum and separated by a distance of one centimeter.
- universal coupling — a coupling between rotating shafts set at an angle to one another, allowing for rotation in three planes.
- 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.
- wildlife programme — (esp on television) a documentary whose subject is wild animals in their natural habitat or undomesticated fauna and flora generally