13-letter words containing o, p, a, c
- optical bench — an apparatus, as a special table or rigid beam, for the precise positioning of light sources, screens, and optical instruments used for optical and photometric studies, having a ruled bar to which these devices can be attached and along which they can be readily adjusted.
- 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.
- 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 glass — any of several types of high-quality, homogeneous, color-free glass, as flint or crown glass, having specified refractive properties, used in lenses and other components of optical systems.
- optical mouse — (hardware) Any kind of mouse that uses visible light or infrared to detect changes in its position.
- optical sound — sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.
- optical wedge — a wedge-shaped filter whose transmittance decreases from one end to the other: used as an exposure control device in sensitometry.
- 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.
- orthocephalic — having a medium or intermediate relation between the height of the skull and the breadth or length.
- orthoepically — In terms of correct pronunciation.
- orthopaedical — Pertaining to orthopaedics; characteristic of orthopaedia.
- oscillographs — Plural form of oscillograph.
- oscillography — a device for recording the wave-forms of changing currents, voltages, or any other quantity that can be translated into electric energy, as sound waves.
- overspeculate — to engage in thought or reflection; meditate (often followed by on, upon, or a clause).
- pablo picasso — Pablo [pah-bloh;; Spanish pah-vlaw] /ˈpɑ bloʊ;; Spanish ˈpɑ vlɔ/ (Show IPA), 1881–1973, Spanish painter and sculptor in France.
- pacific grove — a city in W California, at S end of Monterey Bay.
- 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).
- package store — a store selling sealed bottles or other containers of alcoholic beverages that may only be consumed off the premises.
- packing house — A packing house is a company that processes and packs food, especially meat, to be sold.
- pact of steel — a military alliance concluded between Nazi Germany and Fascist Italy on May 22, 1939, committing each to assist the other in the event of war with another power and pledging that neither would seek a separate peace or armistice.
- palaeoclimate — the climate of a prehistoric age
- palaeocrystic — consisting of former glacial formation
- palaeocurrent — an ancient current, esp of water, evidence of which has been preserved in sedimentary rocks as fossilized ripple marks, etc
- palaeoecology — the study of fossil animals and plants in order to deduce their ecology and the environmental conditions in which they lived
- paleo-asiatic — a member of any of various Mongoloid peoples of northeastern Asia.
- paleomagnetic — Geology. magnetic polarization acquired by the minerals in a rock at the time the rock was deposited or solidified.
- paleotropical — belonging or pertaining to a geographical division comprising the Ethiopian and Oriental regions.
- palm-oil chop — a W African dish made with meat and palm oil
- palmification — the fertilization of date palms artificially
- pamlico sound — a sound between the North Carolina mainland and coastal islands.
- pancreatotomy — incision of the pancreas.
- 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
- pantisocratic — relating to pantisocracy
- pao de acucar — Portuguese name of Sugarloaf Mountain.
- papaveraceous — belonging to the Papaveraceae, the poppy family of plants.
- parabolically — of, relating to, or involving a parable.
- paradoxically — having the nature of a paradox; self-contradictory.
- parapsychosis — an abnormal psychosis
- parasoft corp — Distributors of the message passing system Express.
- parencephalon — a cerebral hemisphere
- paris commune — commune3 (def 8).
- parthenocarpy — the production of fruit without fertilization of an egg in the ovary.
- parti-colored — having different colors in different areas or patches; variegated: a parti-colored dress.