15-letter words containing p, e, r, t, a, i
- absorption edge — a discontinuity in the graph of the absorption coefficient of a substance plotted against the wavelength of x-rays being absorbed, representing the minimum energy necessary to free electrons from particular shells of the atoms of the substance.
- accordion pleat — one of a series of narrow, evenly spaced parallel pleats with alternating raised and recessed folds set into cloth or other material, usually by a commercial pleating machine.
- actinopterygian — belonging or pertaining to the Actinopterygii, a group of bony fishes.
- action reporter — a news reporter who reports to the public on matters of special interest to the consumer.
- acyclic terpene — (originally) any of a class of monocyclic hydrocarbons of the formula C 10 H 16 , obtained from plants.
- adjective group — An adjective group or adjectival group is a group of words based on an adjective, such as 'very nice' or 'interested in football'. An adjective group can also consist simply of an adjective.
- adoption papers — documentation relating to the adoption of a particular child
- age-appropriate — Something that is age-appropriate is suitable for the age that a person is.
- air-superiority — designating a fighter aircraft built for long patrol capability at high altitudes and supersonic speeds, with air-to-air combat as its principal mission.
- alberta clipper — (in Canada) an area of low pressure that forms in winter near the Rocky Mountains
- algerian stripe — a fabric woven with alternate stripes of coarse cotton and silk, usually cream-colored.
- allotetraploidy — the condition of being an allotetraploid
- alopecia areata — loss of hair in circumscribed patches.
- alpes-maritimes — a department of the SE corner of France in Provence-Alpes-Côte-d'Azur region. Capital: Nice. Pop: 1 045 973 (2003 est). Area: 4298 sq km (1676 sq miles)
- alpha privative — (in Greek grammar) the letter alpha (or an- before vowels) used as a negative or privative prefix. It appears in English words derived from Greek, as in atheist, anaesthetic
- alpine accentor — a small bird of the sparrow family, Prunella collaris, found especially in mountain regions of S Europe and Asia
- amphitheatrical — Having some of the characteristics of an amphitheatre.
- amyl propionate — a colorless liquid, C 8 H 16 O 2 , having an applelike odor, used chiefly as a scent in the manufacture of flavorings and perfume.
- anchorage point — a point to which something such as the straps securing a childseat can be safely attached
- angina pectoris — a sudden intense pain in the chest, often accompanied by feelings of suffocation, caused by momentary lack of adequate blood supply to the heart muscle
- antarctic plate — a major tectonic division of the earth's crust, comprising Antarctica and adjacent ocean basins (the South Indian, Southeast Pacific, and Atlantic-Indian basins) and bounded on the north by the Nazca, South American, African, Indo-Australian, and Pacific plates.
- anteprohibition — before prohibition.
- anteroposterior — Relating to or directed toward both front and back.
- anthropocentric — regarding man as the most important and central factor in the universe
- anthropogenesis — the study of the origins of man
- anthropometrics — the science of measuring the size and proportions of the human body (called anthropometry), especially as applied to the design of furniture and machines.
- anthropophagite — a cannibal
- anti-censorship — the act or practice of censoring.
- anti-depressant — An anti-depressant is a drug which is used to treat people who are suffering from depression.
- anti-productive — having the power of producing; generative; creative: a productive effort.
- anti-republican — of, relating to, or of the nature of a republic.
- anti-separatist — a person who separates, withdraws, or secedes, as from an established church.
- antidepressants — of or relating to a substance that is used in the treatment of mood disorders, as characterized by various manic or depressive affects.
- antiperistalses — Plural form of antiperistalsis.
- antiperistalsis — contractions of the intestine that force the contents in the opposite direction to the normal
- antiperistaltic — reversed peristaltic action of the intestines, by which their contents are carried upward.
- antiperspirants — Plural form of antiperspirant.
- antiprogressive — opposed to or acting against progression in society
- aphrodite terra — a large plateau region that stretches approximately halfway around the middle latitude of Venus.
- apical meristem — meristem at the apex of a root or shoot.
- apolipoproteins — Plural form of apolipoprotein.
- apollo asteroid — one of a number of asteroids whose orbits cross that of the earth.
- apostle pitcher — a stoneware pitcher decorated in relief with figures of the apostles.
- appeal tribunal — An appeal tribunal is a special court or committee that is formed to reconsider a decision made by another court or committee.
- apprentice work — work done when young and a novice
- apprenticeships — Plural form of apprenticeship.
- appropriateness — suitable or fitting for a particular purpose, person, occasion, etc.: an appropriate example; an appropriate dress.
- approximateness — The quality of being approximate.
- arc de triomphe — the triumphal arch in Paris begun by Napoleon I to commemorate his victories of 1805–6 and completed in 1836
- archiepiscopate — the rank, office, or term of office of an archbishop
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