18-letter words containing p, l, a, y, g
- reporters' gallery — an area in parliament reserved for journalists and reporters
- sampling frequency — sample rate
- self-deprecatingly — in a self-deprecating manner
- sociopsychological — of, relating to, or characterized by interrelated social and psychological factors.
- 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.
- superciliary ridge — browridge.
- 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.