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13-letter words containing o, p, t, c

  • optic chiasma — a site at the base of the forebrain where the inner half of the fibers of the left and right optic nerves cross to the opposite side of the brain.
  • 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.
  • 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.
  • out of pocket — small enough or suitable for carrying in the pocket: a pocket watch.
  • out-of-pocket — paid out in cash or from one's own financial resources and sometimes reimbursed: My out-of-pocket travel expenses included taking business clients to dinner.
  • outer product — cross product.
  • outprocessing — to end a military tour of duty, accompanied by necessary paperwork: All enlisted soldiers out-process as a class.
  • output device — (hardware)   Electronic or electromechanical equipment connected to a computer and used to transfer data out of the computer in the form of text, images, sounds or other media to a display screen, printer, loudspeaker or storage device. Most modern storage devices such as disk drives and magnetic tape drives act as both input and output devices, others such as CD-ROM are input only.
  • overspeculate — to engage in thought or reflection; meditate (often followed by on, upon, or a clause).
  • package store — a store selling sealed bottles or other containers of alcoholic beverages that may only be consumed off the premises.
  • 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
  • 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.
  • palmification — the fertilization of date palms artificially
  • pancreatotomy — incision of the pancreas.
  • pandiculation — the act of stretching oneself.
  • pantisocratic — relating to pantisocracy
  • parasoft corp — Distributors of the message passing system Express.
  • 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.
  • participation — an act or instance of participating.
  • participatory — to take or have a part or share, as with others; partake; share (usually followed by in): to participate in profits; to participate in a play.
  • particleboard — a boardlike building material made by compressing sawdust or wood particles with a resin binder
  • partly cloudy — sky: not constantly clear
  • party-colored — having different colors in different areas or patches; variegated: a parti-colored dress.
  • past historic — the simple past
  • pastoral care — help with personal needs and problems given by a teacher
  • 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.
  • patrifocality — the system or fact of being patrifocal
  • patriotically — of, like, suitable for, or characteristic of a patriot.
  • peacock plant — a plant, Calathea makoyana, native to Brazil, having leaves that are spotted on the upper surface and purple on the lower surface.
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