16-letter words containing r, d, a

prestidigitation — sleight of hand; legerdemain.
preunderstanding — to perceive the meaning of; grasp the idea of; comprehend: to understand Spanish; I didn't understand your question.
pribilof islands — a group of islands in the Bering Sea, off SW Alaska, belonging to the US: the breeding ground of the northern fur seal. Area: about 168 sq km (65 sq miles)
price leadership — the setting of the price of a product or service by a dominant firm at a level that competitors can match, in order to avoid a price war
primary deviance — the violation of a norm or rule that does not result in the violator's being stigmatized as deviant.
primary industry — an industry, as agriculture, forestry, or fishing, that deals in obtaining natural materials.
primary producer — any green plant or any of various microorganisms that can convert light energy or chemical energy into organic matter.
printer's reader — a person employed to read proofs and indicate errors
private judgment — personal opinion formed independently of the expressed position of an institution, as in matters of religion or politics.
private viewdata — an interactive video text system with restricted access
privet andromeda — a spreading shrub, Lyonia ligustrina, of the eastern U.S., having leafless, white flowers in terminal clusters.
privileged altar — an altar at which a plenary indulgence for a departed soul may be granted upon celebration of a Mass.
program director — a chief executive responsible for selecting and scheduling programs.
programme editor — someone responsible for editing, overseeing and selecting the content of radio or television programmes
project guardian — (project, security) A project which grew out of the ARPA support for Multics and the sale of Multics systems to the US Air Force. The USAF wanted a system that could be used to handle more than one security classification of data at a time. They contracted with Honeywell and MITRE Corporation to figure out how to do this. Project Guardian led to the creation of the Access Isolation Mechanism, the forerunner of the B2 labeling and star property support in Multics. The DoD Orange Book was influenced by the experience in building secure systems gained in Project Guardian.
prolonged-action — sustained-release.
promotional code — A promotional code is a code offered by retailers to customers who can use it to receive a discounted price when buying products online.
proper adjective — an adjective formed from a proper noun, as American from America.
pseudo-isidorian — of or relating to the collection of documents of the 9th century a.d. that consist chiefly of the Decretals, attributed to Isidore, archbishop of Seville, a.d. 600–36, and that were rejected as spurious in the 15th century.
pseudo-patriotic — of, like, suitable for, or characteristic of a patriot.
pseudo-realistic — interested in, concerned with, or based on what is real or practical: a realistic estimate of costs; a realistic planner.
pseudo-spiritual — of, relating to, or consisting of spirit; incorporeal.
pseudohistorical — of, pertaining to, treating, or characteristic of history or past events: historical records; historical research.
pseudoparenchyma — (in certain fungi and red algae) a compact mass of tissue, made up of interwoven hyphae or filaments, that superficially resembles plant tissue.
pseudoperipteral — having a freestanding colonnade at each end, with engaged columns at the sides.
puddling-furnace — the act of a person or thing that puddles.
pullorum disease — a highly contagious, frequently fatal disease of young poultry caused by the bacterium Salmonella gallinarum (pullorum), transmitted by the infected hen during egg production, and characterized by weakness, loss of appetite, and diarrhea.
purple sandpiper — a sandpiper, Calidris maritima, of arctic regions of the New and Old World, having in winter a slate-gray back with purplish reflections.
pyramidal orchid — a chalk-loving orchid, Anacamptis pyramidalis, bearing a dense cone-shaped spike of purplish-pink flowers with a long curved spur
pyroracemic acid — pyruvic acid.
pyrovanadic acid — an oxyacid of vanadium, known chiefly in the form of its vanadate salts; Formula: H4V2O7
pyruvic aldehyde — a yellow, liquid compound, C 3 H 4 O 2 , containing both an aldehyde and a ketone group, usually obtained in a polymeric form: used chiefly in organic synthesis.
quadricentennial — of, relating to, or marking the completion of a period of four hundred years.
quadrimillennial — Occurring every four thousand years.
quasi-democratic — pertaining to or of the nature of democracy or a democracy.
queen maud range — a mountain range in Antarctica, in Ross Dependency, S of the Ross Sea.
radial (arm) saw — a circular saw suspended from a pivoted horizontal arm along which it can be moved
radial paralysis — paralysis of a forelimb as a result of loss of function of the radial nerve, usually following traumatic injury
radiant exitance — the ability of a surface to emit radiation expressed as the radiant flux emitted per unit area at a specified point on the surface
radiation levels — the levels of the emission or transfer of radiant energy or the levels of the particles emitted in the transfer of radiant energy, esp the particles and gamma rays emitted in nuclear decay
radio evangelist — a Christian minister who devotes time to preaching on the radio
radio microphone — a microphone incorporating a radio transmitter so that the user can move around freely
radio-controlled — A radio-controlled device works by receiving radio signals which operate it.
radio-phonograph — a radio and phonograph combined in one unit and sharing some components, as the amplifier and speaker(s)
radiographically — the production of radiographs.
radioimmunoassay — a test procedure that integrates immunologic and radiolabeling techniques to measure minute quantities of a substance, as a protein, hormone, or drug, in a given sample of body fluid or tissue.
radiosymmetrical — radially symmetrical.
radiotransparent — transparent to radiation; invisible in x-ray photographs and under fluoroscopy (opposed to radiopaque).
radium emanation — (formerly) radon.
radius of action — the maximum distance that a ship, aircraft, or land vehicle can travel from its base and return without refuelling

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