13-letter words containing p, a, r, o

nonreciprocal — given or felt by each toward the other; mutual: reciprocal respect.
normally-open — Normally-open switch contacts are in an open state at rest.
normocephalic — Having a normal sized head; neither macrocephalic nor microcephalic; mesocephalic.
northern cape — the largest but least populated province in South Africa, in the NW part of the country; created in 1994 from part of Cape Province: agriculture, mining (esp diamonds). Capital: Kimberley. Pop: 1 145 861 (2011 est). Area: 139 703 sq km (361 830 sq miles)
norway spruce — a European spruce, Picea abies, having shiny, dark-green needles, grown as an ornamental.
nosogeography — the study of the geographical causes and distribution of diseases.
notary public — a public officer or other person authorized to authenticate contracts, acknowledge deeds, take affidavits, protest bills of exchange, take depositions, etc.
nuclear power — power derived from nuclear energy.
ocean springs — a town in SE Mississippi.
oceanographer — the branch of physical geography dealing with the ocean.
oceanographic — the branch of physical geography dealing with the ocean.
of many parts — having many different abilities
old provencal — the Provençal language as found in documents from the 11th to the 16th centuries. Abbreviation: OPr.
omnicorporeal — Comprehending or including all bodies; embracing all substance.
on a par with — If you say that two people or things are on a par with each other, you mean that they are equally good or bad, or equally important.
on one's part — a portion or division of a whole that is separate or distinct; piece, fragment, fraction, or section; constituent: the rear part of the house; to glue the two parts together.
on the carpet — a heavy fabric, commonly of wool or nylon, for covering floors.
on the parish — receiving parochial relief
onus probandi — the burden of proof.
onychophorans — Plural form of onychophoran.
open fracture — compound fracture.
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-standard — (of computer programs, codes, etc) freely available to all users
openheartedly — Alt form open-heartedly.
opentransport — (networking) (OT) A complete reimplementation of all levels of the Macintosh networking code including "Classic" AppleTalk and MacTCP. It appeared in MacOS revision 7.5.3 [or earlier? Date?].
opera comique — comic opera.
opera company — a company that puts on productions of operas
opera glasses — small binoculars
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.
opisthography — the practice of writing on the front and back of a parchment or papyrus
oppignoration — the act or an instance of pawning or pledging
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
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.
ora pro nobis — a Latin invocation meaning pray for us
orchesography — a written study of dancing
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.
organotherapy — the branch of therapeutics that deals with the use of remedies prepared from the organs of animals, as from the thyroid gland, the pancreas, or the suprarenal bodies.
organotropism — Physiology. the attraction of microorganisms or chemical substances to particular organs or tissues of the body.
ornithophobia — Fear of birds.
oropharyngeal — the part of the pharynx between the soft palate and the upper edge of the epiglottis.
orthocephalic — having a medium or intermediate relation between the height of the skull and the breadth or length.

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