12-letter words containing a, p, e, r, i
- pearly white — white and lustrous as a pearl.
- pectoral fin — (in fishes) either of a pair of fins usually situated behind the head, one on each side, and corresponding to the forelimbs of higher vertebrates.
- pediatrician — a physician who specializes in pediatrics.
- pedicellaria — one of the minute pincerlike structures common to starfish and sea urchins, used for cleaning and to capture tiny prey.
- pelecaniform — of, or having the nature of, an order (Pelecaniformes) of swimming birds having all four toes connected in a webbed foot, including pelicans and cormorants
- peltier heat — the heat gained or lost at a junction of a thermocouple due to the Peltier effect.
- pencil cedar — the red cedar, Juniperus virginiana, or its wood.
- penitentiary — a place for imprisonment, reformatory discipline, or punishment, especially a prison maintained in the U.S. by a state or the federal government for serious offenders.
- pentacrinoid — a larval crinoid resembling members of the genus Pentacrinus
- pepys' diary — a diary kept by Samuel Pepys from January 1, 1660 to May 31, 1669, in which are recorded his impressions of contemporary London life, the life of the court, and the administration of the navy.
- perceptional — the act or faculty of perceiving, or apprehending by means of the senses or of the mind; cognition; understanding.
- percussional — of or relating to percussion
- pereira bark — the bark of any of several South American trees belonging to the genus Geissospermum, of the dogbane family, especially that of G. vellosii, used in Brazil to allay fever.
- perenniality — lasting for an indefinitely long time; enduring: her perennial beauty.
- perfectation — the action or process of becoming or causing to become perfect or complete
- perforations — the holes punched that allow individual stamps, coupons, etc to be easily separated
- performative — (of an expression or statement) performing an act by the very fact of being uttered, as with the expression “I promise,” that performs the act of promising.
- 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.
- perinatology — a field of medicine focusing on problems emerging during the perinatal period.
- period drama — a drama set in a particular historical period
- periodic law — the law that the properties of the elements are periodic functions of their atomic numbers.
- periodically — recurring at intervals of time: periodic revivals of an interest in handicrafts.
- periostracum — the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
- peripherally — pertaining to, situated in, or constituting the periphery: peripheral resistance on the outskirts of the battle area.
- periphrastic — circumlocutory; roundabout.
- peristomatic — surrounding a leaf's stoma or stomata
- peritoneally — through the peritoneum
- peritrichate — (of bacteria) having flagella on the entire surface.
- perivisceral — surrounding or situated about the viscera.
- permeability — the property or state of being permeable.
- pernoctation — the act of staying all night in a place, esp for prayer or as a vigil
- perorational — of, pertaining to, or characteristic of a peroration
- peroxidation — a type of reaction in which oxygen atoms are formed leading to the production of peroxides. It is stimulated in the body by certain toxins and infections
- perpetrating — to commit: to perpetrate a crime.
- perpetration — to commit: to perpetrate a crime.
- perpetualism — a belief in the permanence of a given thing; the belief that a given thing (e.g. the world, a political system) will last forever
- perpetualist — someone who holds to any form of perpetualism
- perpetuality — continuing or enduring forever; everlasting.
- perpetuating — to make perpetual.
- perpetuation — to make perpetual.
- perphenazine — a crystalline, water-insoluble powder, C 2 1 H 2 6 ClN 3 OS, used chiefly as a tranquilizer and in the treatment of intractable hiccoughs and nausea and vomiting.
- persian gulf — strait in the Indian Ocean
- persian knot — a hand-tied knot, used in rug weaving, in which the ends of yarn looped around a warp thread appear at each of the interstices between adjacent threads and produce a compact and relatively even pile effect.
- persian lamb — the young lamb of the Karakul sheep.
- personalised — to have marked with one's initials, name, or monogram: to personalize stationery.
- personalized — customized
- perspectival — a technique of depicting volumes and spatial relationships on a flat surface. Compare aerial perspective, linear perspective.