12-letter words containing m, e, r, p
- pedomorphism — a speeding up of the rate of development, resulting in an adult form that has the appearance of its larval or juvenile ancestor.
- 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
- pen computer — a computer, as a personal digital assistant, having pattern-recognition software enabling it to read handwritten text or drawings input on the screen by means of a stylus.
- penetrometer — a device for measuring the penetrating power of x-ray or other radiations.
- people mover — any of various forms of mass transit, as moving sidewalks or automated driverless vehicles, used for transporting people along limited, fixed routes, as around airports or congested urban areas.
- perambulator — baby carriage.
- peremptorily — leaving no opportunity for denial or refusal; imperative: a peremptory command.
- perfect game — a baseball game in which the same player pitches throughout the full game without allowing any player of the opposing team to reach first base by a base hit, base on balls, error, or any other means. Compare no-hitter.
- perfect ream — a standard quantity of paper, consisting of 20 quires or 500 sheets (formerly 480 sheets), or 516 sheets (printer's ream or perfect ream)
- 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.
- pericementum — periodontal membrane.
- 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.
- perinephrium — the capsule of connective tissue that envelops the kidney.
- period drama — a drama set in a particular historical period
- periodontium — the bone, connective tissue, and gum surrounding and supporting a tooth.
- perionychium — the epidermis surrounding the base and sides of a fingernail or toenail.
- periostracum — the external, chitinlike covering of the shell of certain mollusks that protects the limy portion from acids.
- periselenium — the closest point of the orbit of a spacecraft to the moon
- perispomenon — (of a Greek word) bearing a circumflex accent on the last syllable
- peristomatic — surrounding a leaf's stoma or stomata
- permaculture — a system of cultivation intended to maintain permanent agriculture or horticulture by relying on renewable resources and a self-sustaining ecosystem.
- permanganate — a salt of permanganic acid, as potassium permanganate.
- permeability — the property or state of being permeable.
- permissioned — authorization granted to do something; formal consent: to ask permission to leave the room.
- permissively — habitually or characteristically accepting or tolerant of something, as social behavior or linguistic usage, that others might disapprove or forbid.
- permissivism — lenience toward or indulgence of a wide variety of social behavior.
- permissivist — lenience toward or indulgence of a wide variety of social behavior.
- permittivity — Electricity. the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum.
- 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
- persian lamb — the young lamb of the Karakul sheep.
- petrochemist — someone who studies petrochemistry or works in the petrochemical industry
- 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).
- 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.
- 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.
- phone number — of individual, business
- photopolymer — a polymer or plastic that undergoes a change in physical or chemical properties when exposed to light.
- photorealism — a style of painting flourishing in the 1970s, especially in the U.S., England, and France, and depicting commonplace scenes or ordinary people, with a meticulously detailed realism, flat images, and barely discernible brushwork that suggests and often is based on or incorporates an actual photograph.
- photothermic — pertaining to the thermal effects of light.
- phrase-maker — a person who is skilled in coining well-turned phrases; phraseologist.
- phrasemaking — the making up or coining of memorable phrases or slogans
- phrasemonger — phrasemaker (def 2).
- phytohormone — hormone (def 3).
- piatra neamt — a city in NE Romania, in Moldavia.
- picrocarmine — a red powder containing carmine and picric acid which is used in staining processes
- picture mold — a molding near a ceiling from which pictures can be suspended.
- piet-my-vrou — a cuckoo, Notococcyx solitarius, having a red breast
- placentiform — shaped like a placenta, with a flat rounded form
- plasmasphere — a region of cool plasma surrounding the earth, extending 8000–25,000 miles (13,000–40,000 km) into space, and bounded by the plasmapause.