18-letter words containing p, r, e, b, i, o
- probability theory — the theory of analyzing and making statements concerning the probability of the occurrence of uncertain events. Compare probability (def 4).
- protease inhibitor — a drug that inhibits the action of protease, especially any of a class of antiviral drugs that prevent the cleavage and replication of HIV proteins.
- pseudotuberculosis — an acute, sometimes fatal disease of rodents, birds, and other animals, including humans, caused by the bacterium Yersinia (Pasteurella) pseudotuberculosis, and characterized by the formation of nodules resembling those that result from tuberculosis.
- pulmonary embolism — the blockage of a pulmonary artery, often by a blood clot, that stops the flow of blood to the lungs and which can result in death if untreated
- rabbit-proof fence — a fence through which rabbits are unable to pass
- ribbon development — housing or commercial buildings built along a stretch of road.
- september holidays — a period of time in September when people do not have to go to school, college or work
- subatomic particle — physics:
- supraorbital ridge — browridge.
- tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
- transporter bridge — a bridge for carrying passengers and vehicles by means of a platform suspended from a trolley.