13-letter words containing r, a, y, s, i
- parapsychosis — an abnormal psychosis
- parasexuality — parasexual behaviour
- parasitically — of, relating to, or characteristic of parasites.
- parasymbiosis — the symbiotic relationship that occurs between certain species of fungi and lichens (which are themselves symbiotic associations between a fungus and an alga)
- parasynthesis — the formation of a word by the addition of a derivational suffix to a phrase or compound, as of greathearted, which is great heart plus -ed.
- parasynthetic — the formation of a word by the addition of a derivational suffix to a phrase or compound, as of greathearted, which is great heart plus -ed.
- parry islands — former name of the Queen Elizabeth Islands.
- parsley piert — a small N temperate rosaceous plant, Aphanes arvensis, having fan-shaped leaves and small greenish flowers
- patriot's day — the third Monday in April, a legal holiday in Me. and Mass. commemorating the battles of Lexington and Concord (April 19, 1775)
- patriots' day — the anniversary of the battles of Lexington and Concord (1775), celebrated the third Monday in April: a legal holiday in Massachusetts and Maine.
- pearly whites — white and lustrous as a pearl.
- peirastically — in a peirastic manner
- peninsularity — the state or fact of being a peninsula
- perishability — subject to decay, ruin, or destruction: perishable fruits and vegetables.
- perissodactyl — having an uneven number of toes or digits on each foot.
- petrophysical — relating to the analysis of the constitution and characteristics of rocks
- physharmonica — a keyboard musical instrument fitted with free reeds, and which is an early form of harmonium
- physiographic — the science of physical geography.
- physiotherapy — physical therapy.
- phytosanitary — of or relating to the health of plants
- platykurtosis — the state of being platykurtic.
- playing cards — cards used in playing various games, arranged in decks of four suits (spades, hearts, diamonds, and clubs): a standard deck has 52 cards
- polyarteritis — inflammation of the layers of an artery or of many arteries, usually caused by a severe hypersensitivity reaction, and characterized by nodules and hemorrhage along the involved vessels.
- polyarthritis — arthritis occurring in more than one joint.
- polyoma virus — a small DNA-containing virus, of the papovavirus group, that can produce a variety of tumors in mice, hamsters, rabbits, and rats.
- polyribosomal — relating to a polyribosome
- possessionary — of, relating to, or characterized by possession
- post-tertiary — denoting or formed after the Tertiary period of geological time
- postcranially — affecting the postcranium
- prairie style — the style of the architects of the Prairie School.
- prefix syntax — prefix notation
- presentiality — the state of being present
- primary tense — in Latin, Greek, and Sanskrit, a tense referring to present or future time
- priority case — a matter that takes precedence over others
- prismatically — of, relating to, or like a prism.
- private study — the act or process of studying outwith classes
- processionary — of, relating to, or moving in a procession
- provisionally — providing or serving for the time being only; existing only until permanently or properly replaced; temporary: a provisional government.
- psychographic — Psychology. a graph indicating the relative strength of the personality traits of an individual.
- quality press — the more serious newspapers which give detailed accounts of world events, as well as reports on business, culture, and society
- quasi-crystal — a group of atoms resembling a crystal but not having symmetrical plane faces
- quasimilitary — Having certain military aspects.
- ratushinskaya — Irina (ɪˈriːnə). born 1954, Russian poet and writer: imprisoned (1983–86) in a Soviet labour camp on charges of subversion. Her publications include Poems (1984), Grey is the Colour of Hope (1988), and The Odessans (1992)
- ray tomlinson — (person) An engineer at Bolt Beranek and Newman who, in July 1972 while designing the first[?] electronic mail program, chose the commercial at symbol "@" to separate the user name from the computer name.
- rayleigh disc — a small light disc suspended in the path of a sound wave, used to measure the intensity of the sound by analysing the resulting deflection of the disc
- rayleigh disk — a small circular disk, usually of mica, that is suspended from a fiber and tends to be deflected at right angles to a stream of air, indicating by its deflection the intensity of a sound wave.
- re-entry visa — a visa that allows someone to enter a country again several times
- realistically — interested in, concerned with, or based on what is real or practical: a realistic estimate of costs; a realistic planner.
- reality-based — (especially of television) portraying or alleging to portray events as they actually happened.
- reasonability — agreeable to reason or sound judgment; logical: a reasonable choice for chairman.