13-letter words containing o, n, p, a, i
- optical flint — an optical glass of high dispersion and high refractive index containing lead oxide. They are used in the manufacture of lenses, artificial gems, and cut glass
- optical sound — sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.
- optimizations — Plural form of optimization.
- 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
- outmanipulate — to surpass in manipulation
- outwash plain — Geology. a broad, sloping landform built of coalesced deposits of outwash.
- over-planning — a scheme or method of acting, doing, proceeding, making, etc., developed in advance: battle plans.
- overexpansion — the act or process of expanding.
- overpedalling — the overuse of the piano's pedals
- overpotential — overvoltage.
- ovipositional — pertaining to the laying of eggs through an ovipositor
- pacific ocean — an ocean bordered by the American continents, Asia, and Australia: largest ocean in the world; divided by the equator into the North Pacific and the South Pacific. 70,000,000 sq. mi. (181,300,000 sq. km); greatest known depth, 35,433 feet (10,800 meters).
- packing house — A packing house is a company that processes and packs food, especially meat, to be sold.
- paddling pool — A paddling pool is a shallow artificial pool for children to paddle in.
- painted horse — paint (def 6).
- painted woman — a prostitute; slut.
- paleomagnetic — Geology. magnetic polarization acquired by the minerals in a rock at the time the rock was deposited or solidified.
- 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.
- palletization — to place (materials) upon pallets for handling or moving.
- palmification — the fertilization of date palms artificially
- pamlico sound — a sound between the North Carolina mainland and coastal islands.
- pan-teutonism — Pan-Germanism.
- pandiculation — the act of stretching oneself.
- panharmonicon — a mechanical instrument that imitates orchestral sounds
- panleucopenia — a viral disease of cats marked by a deficiency of white blood cells
- panleukopenia — distemper1 (def 1c).
- pannikin boss — an overseer of a small group of workers; person with minor authority.
- panradiometer — an instrument used for measuring radiant heat independently of wavelength
- pantheologist — a student of, or expert in, pantheology
- 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)
- patent office — (often initial capital letters) a governmental agency that administers and regulates patents and trademarks, in the U.S. forming a division of the Department of Commerce.
- pathogenicity — the disease-producing capacity of a pathogen.
- pathognomonic — Medicine/Medical. characteristic or diagnostic of a specific disease: a pathognomonic sign of pneumonia.