19-letter words containing p, e, r, n, d
- deflationary spiral — Geometry. a plane curve generated by a point moving around a fixed point while constantly receding from or approaching it.
- dendrogeomorphology — (geology) the science that uses dendrochronology to study changes to the Earth's surface over time.
- dental receptionist — a receptionist working in a dental surgery
- department chairman — the chairman of a university department
- department of labor — the department of the U.S. federal government that promotes and improves the welfare, opportunities, and working conditions of wage earners. Abbreviation: DOL.
- department of state — the department of the U.S. federal government that sets forth and maintains the foreign policy of the U.S., especially in negotiations with foreign governments and international organizations. Abbreviation: DOS.
- departmentalisation — Alternative spelling of departmentalization.
- departmentalization — to divide into departments.
- dependable software — software reliability
- detective inspector — a police officer who investigates crime and who ranks above a detective sergeant but below a detective chief inspector
- differential backup — (operating system) A kind of backup that copies all files that have changed since the last full backup. Each differential backup will include all files in previous differential backups since the full backup so to restore a version of a file, you only need to search the full backup and the relevant differential backup. Some systems support differential backup by associating an "Archive" flag with each file and setting this flag whenever the file is modified to indicate that it should be included in the next backup. A differential backup does not change this flag, whereas an incremental backup resets it.
- diffraction pattern — the phenomenon exhibited by wave fronts that, passing the edge of an opaque body, are modulated, thereby causing a redistribution of energy within the front: it is detectable in light waves by the presence of a pattern of closely spaced dark and light bands (diffraction pattern) at the edge of a shadow.
- digital linear tape — (storage) (DLT) A kind of magnetic tape drive originally developed by DEC and now marketed by Quantum. DLT drives implement the Digital Lempel Ziv 1 (DLZ1) compression algorithm in a combination of hardware and firmware. They use a popular chip by Stac (now hi/fn) to do the string searching. Counting, sorting and Huffman coding are done in firmware (with hardware support for the Huffman algorithm?). In April 1997 DLT drives can transfer 5 megabytes per second and can store 35 gigabytes on a single cartridge. Compression might roughly double these figures.
- dihydrostreptomycin — an antibiotic, C 21 H 41 N 7 O 12 , derived by organic synthesis from and believed to be less toxic than streptomycin: used in the form of its sulfate chiefly in the treatment of tuberculosis.
- dimetric projection — a type of axonometric projection in which the object is shown with two of its three principal axes tilted equally from the plane of viewing
- direct-vision prism — Amici prism.
- directional coupler — (communications) (tap) A passive device used in cable systems to divide and combine radio frequency signals. A directional coupler has at least three ports: line in, line out, and the tap. The signal passes between line in and line out ports with loss referred to as the insertion loss. A small portion of the signal power applied to the line in port passes to the tap port. A signal applied to the tap port is passed to the line in port less the tap attenuation value. The tap signals are isolated from the line out port to prevent reflections. A signal applied to the line out port passes to the line in port and is isolated from the tap port. Some devices provide more than one tap output line (multi-taps).
- diriment impediment — a fact or circumstance that renders a marriage void from the beginning.
- disjunctive pronoun — an inflection of pronouns in some languages that is used alone or after a preposition, such as moi in French
- dispatch department — the department of an organization responsible for the dispatch of orders
- dispersion relation — the relationship between the angular frequency (ω;) of a wave and the magnitude of its wave vector (k). Thus the wave's speed is ω/k
- display advertising — display ads taken collectively.
- diversional therapy — the structured use of leisure time in recreation and play as a form of or supplement to conventional therapy
- dose-response curve — a curve plotting the relationship between the dose of a drug administered and its pharmacological effect.
- double counterpoint — invertible counterpoint using two transposable voices.
- electrode potential — the potential difference developed when an electrode of an element is placed in a solution containing ions of that element
- empty-nest syndrome — a condition, often involving depression, loneliness, etc, experienced by parents living in a home from which the children have grown up and left
- executive president — a president in certain systems of government who possesses wide powers
- expeditionary force — An expeditionary force is a group of soldiers who are sent to fight in a foreign country.
- extendible compiler — (language) (ETC) A Fortran-like compiler that can be extended with macros.
- feynman, richard p. — Richard P. Feynman
- free alongside ship — (of a shipment of goods) delivered to the dock without charge to the buyer, but excluding the cost of loading onto the vessel
- front-end processor — a small computer or other dedicated device that performs preliminary processing of data for a host computer.
- gedanken experiment — thought experiment.
- germander speedwell — a speedwell, Veronica chamaedrys, having blue flowers.
- get one's dander up — to become or to cause someone to become annoyed or angry
- gigabits per second — (unit) (Gbps) A unit of information transfer rate equal to one billion bits per second. Note that, while a gigabit is defined as a power of two (2^30 bits), a gigabit per second is defined as a power of ten (10^9 bits per second, which is slightly less) than 2^30).
- grade point average — a measure of scholastic attainment computed by dividing the total number of grade points received by the total number of credits or hours of course work taken.
- grievance procedure — the established series of steps to be taken in dealing with a grievance raised with an employer by an employee
- grosse pointe woods — a city in SE Michigan, near Detroit.
- ground-plane aerial — a quarter-wave vertical dipole aerial in which the electrical image forming the other quarter-wave section is formed by reflection in a system of radially disposed metal rods or in a conductive sheet
- highways department — the department of a state, council, etc, responsible for the upkeep of roads and highways
- hydropneumatization — utilization of air pressure in the housing of a water turbine to keep the level of water that has been used from rising to interfere with the rotor blades.
- hyperfocal distance — the distance, at a given f number, between a camera lens and the nearest point (hyperfocal point) having satisfactory definition when focused at infinity.
- idea of pure reason — any of the three undemonstrable entities (a personal soul, a cosmos, and a supreme being) implicit in the fact of a subject and an object of knowledge, and in the need for some principle uniting them.
- imperial presidency — a U.S. presidency that is characterized by greater power than the Constitution allows.
- in definite pronoun — a pronoun, as English some, any, somebody, that leaves unspecified the identity of its referent.
- index expurgatorius — a list of books now included in the Index Librorum Prohibitorum, forbidden to be read except from expurgated editions.
- intercardinal point — any of the four points of the compass midway between the cardinal points; northeast, southeast, southwest, or northwest.
- interdepartmentally — involving or existing between two or more departments: interdepartmental rivalry.