18-letter words containing r, i, p, a, b, l
- prepositional verb — a combination of verb and preposition, often with idiomatic meaning, differing from other phrasal verbs in that an object must always follow the preposition, as take after in The children take after their mother.
- probability theory — the theory of analyzing and making statements concerning the probability of the occurrence of uncertain events. Compare probability (def 4).
- provably difficult — The set or property of problems for which it can be proven that no polynomial-time algorithm exists, only exponential-time algorithms.
- public corporation — a corporation, owned and operated by a government, established for the administration of certain public programs.
- 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
- richard p. gabriel — Richard Gabriel
- september holidays — a period of time in September when people do not have to go to school, college or work
- sierra blanca peak — a mountain in S New Mexico: highest peak in the Sacramento Mountains. 11,997 feet (3651 meters).
- subatomic particle — physics:
- supraorbital ridge — browridge.
- the general public — the people in a society; people in general