13-letter words containing a, r, c, t, o, p
- 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.
- 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.
- 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.
- 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
- paleotropical — belonging or pertaining to a geographical division comprising the Ethiopian and Oriental regions.
- pancreatotomy — incision of the pancreas.
- 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
- patrifocality — the system or fact of being patrifocal
- patriotically — of, like, suitable for, or characteristic of a patriot.
- pearl tapioca — a food substance prepared from cassava in granular, flake, pellet (pearl tapioca) or flour form, used in puddings, as a thickener, etc.
- pedantocratic — of or relating to pedantocracy
- perchlorinate — to combine with the maximum proportion of chlorine.
- perfectionate — to perfect; to make perfect
- periodic rate — The periodic rate is the interest rate charged for each period, such as monthly or quarterly.
- periodicalist — a writer of articles for periodicals
- perissodactyl — having an uneven number of toes or digits on each foot.
- perscrutation — a very careful exploration or inspection
- personalistic — Also called personal idealism. a modern philosophical movement locating ultimate value and reality in persons, human or divine.
- petrification — the act or process of petrifying; the state of being petrified.
- petrochemical — a chemical substance obtained from petroleum or natural gas, as gasoline, kerosene, or petrolatum.
- petrophysical — relating to the analysis of the constitution and characteristics of rocks
- phallocentric — a doctrine or belief centered on the phallus, especially a belief in the superiority of the male sex.
- pharyngectomy — excision of part or all of the pharynx.
- philanthropic — of, pertaining to, engaged in, or characterized by philanthropy; benevolent: a philanthropic foundation.
- photoallergic — photosensitive.
- photoreaction — a chemical reaction that involves or requires light.
- phreatophytic — of, possessing the properties of, or relating to a phreatophyte
- piano teacher — tutor of piano-playing
- pictorialness — the state of being pictorial
- picturization — to represent in a picture, especially in a motion picture; make a picture of.
- platonic year — a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes.
- pneumogastric — of or relating to the lungs and stomach.