19-letter words containing p, r, o, t, n, c
- trusteeship council — a United Nations body that supervises the government of a territory by a foreign country
- under police escort — If you go somewhere or are taken somewhere under police escort, you go there accompanied by a police escort.
- vapor recovery unit — A vapor recovery unit is a system for recovering vapors from inside sealed crude oil or condensate tanks, with a scrubber (= a device for removing unwanted substances) and compressor (= a device that raises pressure).
- velocity microphone — a microphone in which the output varies according to the instantaneous velocity of the air molecules in the incident sound waves.
- write-protect notch — a cut-out on a floppy disk that determines whether a disk is writable
- zenithal projection — a type of map projection in which part of the earth's surface is projected onto a plane tangential to it, either at one of the poles (polar zenithal), at the equator (equatorial zenithal), or between (oblique zenithal)