12-letter words containing p, r, o, c
- perle cotton — a two-ply mercerized cotton thread used chiefly in handweaving and needlework.
- perniciously — causing insidious harm or ruin; ruinous; injurious; hurtful: pernicious teachings; a pernicious lie.
- pernoctation — the act of staying all night in a place, esp for prayer or as a vigil
- pertinacious — holding tenaciously to a purpose, course of action, or opinion; resolute.
- pervicacious — extremely willful; obstinate; stubborn.
- pest control — rats, insects: extermination
- petrifaction — the act or process of petrifying; the state of being petrified.
- petrochemist — someone who studies petrochemistry or works in the petrochemical industry
- petrogenetic — relating to petrogenesis
- petroglyphic — relating to or having the characteristics of a petroglyph or carving made in rock
- petrophysics — the analysis of the constitution and characteristics of rocks
- phallocratic — relating to a male, or the beliefs assumed by such, who assumes authority over females due to his maleness
- phanerogamic — any of the Phanerogamia, a former primary division of plants comprising those having reproductive organs; a flowering plant or seed plant (opposed to cryptogam).
- pharmacolite — hydrous calcium arsenate, 2CaO⋅As 2 O 5 ⋅5H 2 O, formed by natural alteration of mineral deposits containing arsenopyrite and arsenical ores of cobalt and silver.
- pharmacology — the science dealing with the preparation, uses, and especially the effects of drugs.
- pharmacopeia — a book published usually under the jurisdiction of the government and containing a list of drugs, their formulas, methods for making medicinal preparations, requirements and tests for their strength and purity, and other related information.
- phenocrystic — relating to a phenocryst
- philharmonic — fond of or devoted to music; music-loving: used especially in the name of certain musical societies that sponsor symphony orchestras (Philharmonic Societies) and hence applied to their concerts (philharmonic concerts)
- phonographic — of, relating to, or characteristic of a phonograph.
- phosphoresce — to be luminous without sensible heat, as phosphorus.
- photochromic — (of chemically treated glass or plastic) capable of darkening or changing color when exposed to light.
- photocurrent — an electric current produced by a photoelectric effect.
- photographic — of or relating to photography.
- photonuclear — of, relating to, or caused by the collision of high-energy photons with the nucleus of an atom.
- photoproduct — any product which is produced by a chemical reaction that uses light or other electromagnetic radiation to increase energy of particles
- photothermic — pertaining to the thermal effects of light.
- phototrophic — any organism that uses light as its principal source of energy.
- physogastric — pertaining to the swollen, membranous abdomen of certain insects, especially termite and ant queens.
- picornavirus — any of a group of small, RNA-containing viruses of the family Picornaviridae, infectious to humans and other animals, and including the poliovirus and the rhinoviruses that cause the common cold.
- picrocarmine — a red powder containing carmine and picric acid which is used in staining processes
- pictographic — a pictorial sign or symbol.
- pictorialism — Fine Arts. the creation or use of pictures or visual images, especially of recognizable or realistic representations.
- pictorialist — Fine Arts. the creation or use of pictures or visual images, especially of recognizable or realistic representations.
- pictorialize — to make pictorial; illustrate or represent with or as if with pictures.
- picture book — a book consisting mainly or entirely of pictures, especially one for children who have not yet learned to read.
- picture mold — a molding near a ceiling from which pictures can be suspended.
- picture show — motion picture.
- picturephone — a type of telephone where users can see each other as they talk, through the transmission of video images
- pinch roller — a flexible device that presses magnetic tape against the capstan in a tape recorder.
- pindaric ode — an ode consisting of several units, each of which is composed of a strophe and an antistrophe of identical form followed by a contrasting epode.
- pinturicchio — real name Bernardino di Betto. ?1454–1513, Italian painter of the Umbrian school
- pirate coast — an independent federation in E Arabia, formed in 1971, now comprising seven emirates on the S coast (formerly, Pirate Coast or Trucial Coast) of the Persian Gulf, formerly under British protection: Abu Dhabi, Dubai, Sharjah, Ajman, Umm al-Qaiwain, Ras al-Khaimah (joined 1972), and Fujairah. About 32,300 sq. mi. (83,657 sq. km). Capital: Abu Dhabi. Abbreviation: U.A.E.
- pitched-roof — a roof sloping downward in two parts at an angle from a central ridge, so as to leave a gable at each end.
- place-holder — Mathematics, Logic. a symbol in an expression that may be replaced by the name of any element of the set.
- placentiform — shaped like a placenta, with a flat rounded form
- plagiotropic — growing more or less divergent from the vertical.
- planographic — the art or technique of printing from a flat surface directly or by offset.
- plasma torch — an electrical device for converting a gas into a plasma, used for melting metal
- platform car — a railroad freight car having no enclosing sides or top; a flatcar.
- plecopterous — relating to the order Plecoptera or stoneflies