12-letter words containing p, a, c, t
- perfect year — the lunisolar calendar used by Jews, as for determining religious holidays, that is reckoned from 3761 b.c. and was established by Hillel II in the 4th century a.d., the calendar year consisting of 353 days (defective year) 354 days (regular year) or 355 days (perfect year or abundant year) and containing 12 months: Tishri, Heshvan, Kislev, Tevet, Shevat, Adar, Nisan, Iyar, Sivan, Tammuz, Av, and Elul, with the 29-day intercalary month of Adar Sheni added after Adar seven times in every 19-year cycle in order to adjust the calendar to the solar cycle. The Jewish ecclesiastical year begins with Nisan and the civil year with Tishri.
- perfectation — the action or process of becoming or causing to become perfect or complete
- pericarditis — inflammation of the pericardium.
- perichaetial — denoting the leaves in mosses that surround the archegonia and, later, the base of the sporophyte
- perichaetium — a leafy cluster (bracts) around the base of the reproductive organs of some plants, predominantly mosses
- perimetrical — the border or outer boundary of a two-dimensional figure.
- periostracum — the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
- periphrastic — circumlocutory; roundabout.
- peristomatic — surrounding a leaf's stoma or stomata
- peritrichate — (of bacteria) having flagella on the entire surface.
- permaculture — a system of cultivation intended to maintain permanent agriculture or horticulture by relying on renewable resources and a self-sustaining ecosystem.
- pernoctation — the act of staying all night in a place, esp for prayer or as a vigil
- perspectival — a technique of depicting volumes and spatial relationships on a flat surface. Compare aerial perspective, linear perspective.
- perspicacity — keenness of mental perception and understanding; discernment; penetration.
- pertinacious — holding tenaciously to a purpose, course of action, or opinion; resolute.
- pestological — relating to pestology
- pet scanning — the action or process of using a PET scanner to obtain an image.
- petach tikva — a city in W Israel, NE of Tel Aviv.
- petrifaction — the act or process of petrifying; the state of being petrified.
- petrifactive — having the ability to turn substances into stone
- phagocytoses — phagocytize.
- phagocytosis — Physiology. the ingestion of a smaller cell or cell fragment, a microorganism, or foreign particles by means of the local infolding of a cell's membrane and the protrusion of its cytoplasm around the fold until the material has been surrounded and engulfed by closure of the membrane and formation of a vacuole: characteristic of amebas and some types of white blood cells.
- phagocytotic — relating to phagocytosis
- phallocratic — relating to a male, or the beliefs assumed by such, who assumes authority over females due to his maleness
- phantasmatic — pertaining to or of the nature of a phantasm; unreal; illusory; spectral: phantasmal creatures of nightmare.
- phantasmical — pertaining to or of the nature of a phantasm; unreal; illusory; spectral: phantasmal creatures of nightmare.
- pharmaceutic — pertaining to pharmacy or pharmacists.
- 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.
- phenotypical — the observable constitution of an organism.
- phonetic law — a statement of some regular pattern of sound change in a specific language, as Grimm's law or Verner's law.
- phonetically — Also, phonetical. of or relating to speech sounds, their production, or their transcription in written symbols.
- phonocamptic — possessing the property of reflecting sound or producing an echo
- phonotactics — the patterns in which the phonemes of a language may combine to form sequences.
- phosphatidic — of or relating to a phosphatide
- photoactinic — emitting radiation having the chemical effects of light and ultraviolet rays, as on a photographic film.
- photocathode — a cathode, typically of a cesium or sodium compound, having the property of emitting electrons when activated by light or other radiation.
- photodynamic — the science dealing with light and its effects on living organisms.
- photoelastic — displaying photoelasticity; of or relating to photoelasticity
- photographic — of or relating to photography.
- photomachine — a machine that prints copies of digital photographs
- photonuclear — of, relating to, or caused by the collision of high-energy photons with the nucleus of an atom.
- photovoltaic — of or relating to the photovoltaic effect.
- phycoxanthin — a yellow pigment found in brown seaweeds and types of algae
- phylacteries — Judaism. either of two small, black, leather cubes containing a piece of parchment inscribed with verses 4–9 of Deut. 6, 13–21 of Deut. 11, and 1–16 of Ex. 13: one is attached with straps to the left arm and the other to the forehead during weekday morning prayers by Orthodox and Conservative Jewish men.
- physogastric — pertaining to the swollen, membranous abdomen of certain insects, especially termite and ant queens.
- phytoclimate — the climate of a small area, as of confined spaces such as caves or houses (cryptoclimate) of plant communities, wooded areas, etc. (phytoclimate) or of urban communities, which may be different from that in the general region.
- pi character — any special character, such as an accent or mathematical symbol, which is not normally obtained in a standard type fount
- picnic table — table-and-bench structure used outdoors
- pictographic — a pictorial sign or symbol.
- pictorialism — Fine Arts. the creation or use of pictures or visual images, especially of recognizable or realistic representations.