13-letter words containing i, n, p, r, o
- 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.
- 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.
- opisthobranch — any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle and shell and two pairs of tentacles.
- oppignoration — the act or an instance of pawning or pledging
- opportunistic — adhering to a policy of opportunism; practicing opportunism.
- opportunities — Plural form of opportunity.
- oppositionary — the action of opposing, resisting, or combating.
- oprahfication — the perceived increase in people’s desire to discuss their emotions or personal problems, attributed to the influence of confessional television programmes
- optical crown — an optical glass of low dispersion and relatively low refractive index. It is used in the construction of lenses
- ora pro nobis — a Latin invocation meaning pray for us
- organotropism — Physiology. the attraction of microorganisms or chemical substances to particular organs or tissues of the body.
- ornithophobia — Fear of birds.
- orthopinakoid — a crystalline plane
- 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-planning — a scheme or method of acting, doing, proceeding, making, etc., developed in advance: battle plans.
- over-shipment — an act or instance of shipping freight or cargo.
- overexpansion — the act or process of expanding.
- overpedalling — the overuse of the piano's pedals
- overpotential — overvoltage.
- 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.
- painted horse — paint (def 6).
- 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.
- panharmonicon — a mechanical instrument that imitates orchestral sounds
- panradiometer — an instrument used for measuring radiant heat independently of wavelength
- pantisocratic — relating to pantisocracy
- paralipomenon — Chronicles.
- paranormality — the state of being paranormal
- parietal bone — either of a pair of membrane bones forming, by their union at the sagittal suture, part of the sides and top of the skull.
- paris commune — commune3 (def 8).
- parking orbit — a temporary orbit in which a spacecraft awaits the next phase of its mission.
- parotid gland — Also called parotid gland. a salivary gland situated at the base of each ear.
- parthian shot — a sharp, telling remark, act, gesture, etc., made in departing.
- participation — an act or instance of participating.
- partitionable — a division into or distribution in portions or shares.
- partitionment — the act or fact of being partitioned
- passion cross — Latin cross.
- passion fruit — any edible fruit of a passionflower, as the maypop.
- passionflower — any chiefly American climbing vine or shrub of the genus Passiflora, having showy flowers and a pulpy berry or fruit that in some species is edible.
- past anterior — a pluperfect verb (in French)
- patronization — to give (a store, restaurant, hotel, etc.) one's regular patronage; trade with.
- patronizingly — displaying or indicative of an offensively condescending manner: a patronizing greeting, accompanied by a gentle pat on the pack.