15-letter words containing a, c, t, i, o
- psychohistorian — a person who writes psychohistory
- psychotherapist — the treatment of psychological disorders or maladjustments by a professional technique, as psychoanalysis, group therapy, or behavioral therapy.
- public footpath — a footpath along which the public has right of way
- public lavatory — a public toilet
- pulmobranchiate — possessing a pulmobranch
- pyrocrystalline — crystallized from a molten magma or highly heated solution.
- pyrometric bead — (in a kiln) a ball of material that indicates by changing color that a certain temperature has been reached.
- pyrotechnically — in a pyrotechnical manner
- quadruplication — one of four copies or identical items, especially copies of typewritten material.
- quality control — a system for verifying and maintaining a desired level of quality in an existing product or service by careful planning, use of proper equipment, continued inspection, and corrective action as required.
- quantifications — Plural form of quantification.
- quarter section — (in surveying and homesteading) a square tract of land, half a mile on each side, thus containing ¼ sq. mi. or 160 acres. Abbreviation: q.s.
- quasi-automatic — having the capability of starting, operating, moving, etc., independently: an automatic sprinkler system; an automatic car wash.
- quasi-objective — something that one's efforts or actions are intended to attain or accomplish; purpose; goal; target: the objective of a military attack; the objective of a fund-raising drive.
- quasicontinuous — uninterrupted in time; without cessation: continuous coughing during the concert.
- quasihistorical — of, pertaining to, treating, or characteristic of history or past events: historical records; historical research.
- racial minority — a group of a certain race that are in the minority compared to a larger group, the rest of the population, etc
- radial velocity — the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in the wavelength of light emitted by the star.
- radio broadcast — sth transmitted via radio signal
- radio telescope — a system consisting of an antenna, either parabolic or dipolar, used to gather radio waves emitted by celestial sources and bring them to a receiver placed in the focus.
- radiometrically — using a radiometric method, in terms of radiometry
- radiomicrometer — an instrument for measuring small amounts of radiant energy, consisting of a sensitive thermocouple connected to a galvanometer.
- radioprotection — protection against radiation
- radioprotective — giving protection against the effects of radiation
- radiotechnology — the technical application of any form of radiation to industry.
- radiotelemetric — of or relating to radiotelemetry
- re-adjudication — an act of adjudicating.
- re-notification — a formal notifying or informing.
- reaccreditation — the act or process of reaccrediting something or someone
- reaction engine — an engine that produces power as a reaction to the momentum given to gases ejected from it, as a rocket or jet engine.
- reality fiction — a satirical parody of a reality TV show
- rear projection — the projection of filmed action or stills on a translucent screen in front of which actors are lit and filmed: used to simulate an outdoor or location background in the studio.
- rear-projection — the projection of filmed action or stills on a translucent screen in front of which actors are lit and filmed: used to simulate an outdoor or location background in the studio.
- reception class — A reception class is a class that children go into when they first start school at the age of four or five.
- recertification — the act of certifying.
- recognizability — to identify as something or someone previously seen, known, etc.: He had changed so much that one could scarcely recognize him.
- recoil-operated — employing the recoil force of an explosive projectile to prepare the firing mechanism for the next shot.
- recombinant dna — DNA in which one or more segments or genes have been inserted, either naturally or by laboratory manipulation, from a different molecule or from another part of the same molecule, resulting in a new genetic combination.
- recombinational — belonging or relating to recombination
- reconcentration — the act of concentrating again.
- reconceptualize — to form into a concept; make a concept of.
- reconcilability — capable of being reconciled.
- reconfiguration — to change the shape or formation of; remodel; restructure.
- reconsideration — to consider again, especially with a view to change of decision or action: to reconsider a refusal.
- reconsolidation — an act or instance of consolidating; the state of being consolidated; unification: consolidation of companies.
- reconstitutable — to constitute again; reconstruct; recompose.
- recontamination — the act of contaminating, or of making something impure or unsuitable by contact with something unclean, bad, etc.
- recontextualize — to contextualize (something) again
- recreation area — public park
- recreation room — (in a home or public building) a room for informal entertaining, as for dancing, games, cards, etc.