13-letter words containing p, e, r, i, o
- on the parish — receiving parochial relief
- oneiroscopist — a person who specialises in studying and interpreting dreams
- open interval — (mathematics) A type of interval (range of numbers) that does not include either of its endpoints. For example, when mixing red and blue paint, the proportion of red lies in the interval 0% to 100% but can't be exactly 0% or 100% or it wouldn't be a mixture.
- open learning — a system of further education on a flexible part-time basis
- open marriage — a marriage in which the partners agree that each is free to have sexual relationships with other partners.
- open registry — ship registration under a national flag available to all ships regardless of nationality.
- open universe — a model of the universe in which the universe expands forever because there is not enough mass to counteract the expansion by means of gravitational attraction.
- open-timbered — constructed so that the timbers are exposed.
- opening hours — Opening hours are the times during which a shop, bank, library, or bar is open for business.
- opera comique — comic opera.
- operationally — able to function or be used; functional: How soon will the new factory be operational?
- operativeness — (uncountable) The state or quality of being operative.
- opportunities — Plural form of opportunity.
- optical drive — optical disk drive
- optical fiber — optical fibre
- optical fibre — (communications) (fibre optics, FO, US "fiber", light pipe) A plastic or glass (silicon dioxide) fibre no thicker than a human hair used to transmit information using infra-red or even visible light as the carrier (usually a laser). The light beam is an electromagnetic signal with a frequency in the range of 10^14 to 10^15 Hertz. Optical fibre is less susceptible to external noise than other transmission media, and is cheaper to make than copper wire, but it is much more difficult to connect. Optical fibres are difficult to tamper with (to monitor or inject data in the middle of a connection), making them appropriate for secure communications. The light beams do not escape from the medium because the material used provides total internal reflection. See also FDDI, Optical Carrier n, SONET.
- orchestra pit — musicians' seating in front of stage
- orchestra-pit — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
- orthocephalic — having a medium or intermediate relation between the height of the skull and the breadth or length.
- orthoepically — In terms of correct pronunciation.
- orthographies — Plural form of orthography.
- orthographize — to spell correctly or according to the rules of orthography.
- orthopaedical — Pertaining to orthopaedics; characteristic of orthopaedia.
- osteopetrosis — any of several hereditary diseases characterized by increased bone density.
- outperforming — Present participle of outperform.
- outprocessing — to end a military tour of duty, accompanied by necessary paperwork: All enlisted soldiers out-process as a class.
- over-cropping — Agriculture. to crop (land) to excess; exhaust the fertility of by continuous cropping.
- over-occupied — to take or fill up (space, time, etc.): I occupied my evenings reading novels.
- over-planning — a scheme or method of acting, doing, proceeding, making, etc., developed in advance: battle plans.
- over-promised — a declaration that something will or will not be done, given, etc., by one: unkept political promises.
- over-shipment — an act or instance of shipping freight or cargo.
- overamplified — amplified too much, causing distortion or discomfort, etc
- overappraisal — An appraisal that overvalues something.
- overemphasise — (British) alternative spelling of overemphasize.
- overemphasize — to emphasize excessively.
- overexpansion — the act or process of expanding.
- overflow pipe — a pipe which discharges excess or leaking water safely
- overimpressed — very impressed
- overpedalling — the overuse of the piano's pedals
- overpotential — overvoltage.
- overprescribe — to lay down, in writing or otherwise, as a rule or a course of action to be followed; appoint, ordain, or enjoin.
- overprovision — a clause in a legal instrument, a law, etc., providing for a particular matter; stipulation; proviso.
- overreporting — an account or statement describing in detail an event, situation, or the like, usually as the result of observation, inquiry, etc.: a report on the peace conference; a medical report on the patient.
- pacific grove — a city in W California, at S end of Monterey Bay.
- paedomorphism — the continuation of juvenile characteristics in the adult stage
- painted horse — paint (def 6).
- palaeocrystic — consisting of former glacial formation
- paleosiberian — a group of languages comprising those languages of Siberia that are not affiliated with Indo-European, Altaic, Uralic, or Eskimo-Aleut and including the Chukotian family and the unrelated language isolates Ket, Nivkh, and Yukaghir; Paleo-Asiatic.
- paleotropical — belonging or pertaining to a geographical division comprising the Ethiopian and Oriental regions.
- panradiometer — an instrument used for measuring radiant heat independently of wavelength