15-letter words containing p, i, r, a, o
- utility program — system software used to perform standard operations, as sorting data or copying data from one file to another, for application programs or other system software.
- variola porcina — an acute infectious viral disease of pigs characterized by skin eruptions
- vernier compass — a compass on a transit (vernier transit) having a vernier for adjusting magnetic bearings to read as true bearings.
- vicar apostolic — Roman Catholic Church. a titular bishop serving either in a district where no episcopal see has been established, or in one where the succession of bishops has been interrupted.
- vine phylloxera — a homopterous insect, Phylloxera vitifolia, typically feeding on vine juices
- water pollution — the pollution of the sea and rivers
- weapons carrier — a light truck for transporting weapons or munitions in the field.
- weatherproofing — Present participle of weatherproof.
- windfall profit — a profit that arises thanks to an external event over which the person profiting had no control
- working capital — the amount of capital needed to carry on a business.
- xerographically — In a xerographic way; by xerography.
- xeroradiography — an x-ray utilizing a specially coated plate that allows a picture to be developed without the use of liquid chemicals.
- xylotypographic — involving or pertaining to xylotypography
- yorke peninsula — a peninsula in S Australia between Spencer Gulf and the Gulf of St. Vincent. 160 miles (257 km) long and 20–35 miles (32–56 km) wide.
- z-zero particle — one of three particles, called intermediate vector bosons, that are believed to transmit the weak force. Symbol: Z 0.
- zoogeographical — Pertaining to zoogeography.