19-letter words containing p, r, e, g, l
- accelerated program — a course of study which allows students to progress through their education more quickly than usual
- accompanying letter — a letter that comes with another document or enclosure
- aerial top dressing — the process of spreading lime, fertilizer, etc over farmland from an aeroplane
- agner krarup erlang — (person) (1878-1929) A Danish mathematician. Erlang the language and unit were named after him. Interested in the theory of probability, in 1908 Erlang joined the Copenhagen Telephone Company where he studied the problem of waiting times for telephone calls. He worked out how to calculate the fraction of callers who must wait due to all the lines of an exchange being in use. His formula for loss and waiting time was published in 1917. It is now known as the "Erlang formula" and is still in use today.
- algebraic data type — (programming) (Or "sum of products type") In functional programming, new types can be defined, each of which has one or more constructors. Such a type is known as an algebraic data type. E.g. in Haskell we can define a new type, "Tree": data Tree = Empty | Leaf Int | Node Tree Tree with constructors "Empty", "Leaf" and "Node". The constructors can be used much like functions in that they can be (partially) applied to arguments of the appropriate type. For example, the Leaf constructor has the functional type Int -> Tree. A constructor application cannot be reduced (evaluated) like a function application though since it is already in normal form. Functions which operate on algebraic data types can be defined using pattern matching: depth :: Tree -> Int depth Empty = 0 depth (Leaf n) = 1 depth (Node l r) = 1 + max (depth l) (depth r) The most common algebraic data type is the list which has constructors Nil and Cons, written in Haskell using the special syntax "[]" for Nil and infix ":" for Cons. Special cases of algebraic types are product types (only one constructor) and enumeration types (many constructors with no arguments). Algebraic types are one kind of constructed type (i.e. a type formed by combining other types). An algebraic data type may also be an abstract data type (ADT) if it is exported from a module without its constructors. Objects of such a type can only be manipulated using functions defined in the same module as the type itself. In set theory the equivalent of an algebraic data type is a discriminated union - a set whose elements consist of a tag (equivalent to a constructor) and an object of a type corresponding to the tag (equivalent to the constructor arguments).
- algebraic operation — any of the mathematical operations of addition, subtraction, multiplication, division, raising to a power, or extraction of a root.
- angle of depression — depression (def 11).
- apollonius of perga — ?261–?190 bc, Greek mathematician, remembered for his treatise on conic sections
- apres moi le deluge — after me the deluge
- auricular appendage — auricle (def 1b).
- auricular-appendage — Anatomy. the projecting outer portion of the ear; pinna. Also called auricular appendage. an ear-shaped appendage projecting from each atrium of the heart. (loosely) the atrium.
- beta-naphthyl group — See under naphthyl.
- blue-ringed octopus — a highly venomous octopus, Octopus maculosus, of E Australia which exhibits blue bands on its tentacles when disturbed
- brightline spectrum — the spectrum of an incandescent substance appearing on a spectrogram as one or more bright lines against a dark background.
- camouflage passport — a passport from a non-existent country intended to conceal the bearer's true nationality (from hijackers, kidnappers, etc)
- canterbury pilgrims — the pilgrims whose stories are told in Chaucer's Canterbury Tales
- carbon steel piping — Carbon steel piping is pipes made of steel with carbon as the main alloying component, used for transporting fluids.
- chain-reacting pile — nuclear reactor
- chemical processing — Chemical processing is a way of making changes to chemical compounds.
- cinematographically — a motion-picture projector.
- college-preparatory — preparing a student for academic work at the college level.
- complementary angle — either of two angles whose sum is 90°
- complete quadrangle — a plane figure consisting of four points connected by six lines
- compression molding — a method of molding thermosetting plastic by closing a mold on it, forming the material by heat and pressure.
- comptroller general — the director of the General Accounting Office
- creeping cinquefoil — any of several plants belonging to the genus Potentilla, of the rose family, having yellow, red, or white five-petaled flowers, as P. reptans (creeping cinquefoil) of the Old World, or P. argentea (silvery cinquefoil) of North America.
- dangling participle — a participle intended to modify a noun but having the wrong grammatical relationship to it as for example having left in the sentence Having left Europe for good, Peter's future seemed bleak indeed
- dendrogeomorphology — (geology) the science that uses dendrochronology to study changes to the Earth's surface over time.
- 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.
- display advertising — display ads taken collectively.
- echoencephalography — a device that employs reflected ultrasonic waves to examine the position of brain structures.
- electrocardiographs — Plural form of electrocardiograph.
- electrocardiography — The measurement of electrical activity in the heart and the recording of such activity as a visual trace (on paper or on an oscilloscope screen), using electrodes placed on the skin of the limbs and chest.
- electron micrograph — a photograph or image of a specimen taken using an electron microscope
- electronic graphics — (on television) the production of graphic designs and text by electronic means
- electropalatography — the study of the movements of the tongue during speech using touch-sensitive electrodes in the mouth linked to a computer
- electrophotographic — Of or pertaining to electrophotography.
- electrophysiologist — A physiologist whose speciality is electrophysiology.
- emergency telephone — a public telephone intended for use in emergencies: for example, at the side of a motorway
- entitlement program — a government program providing defined sectors of the population with social benefits
- evaporative cooling — a method of reducing temperature that uses evaporation
- executive privilege — Executive privilege is the right that a member of the executive branch of government has to withhold information about matters that they consider to be confidential.
- exophthalmic goiter — a disease of unknown cause characterized by enlargement of the thyroid gland, overproduction of the thyroid hormone, and abnormal protrusion of the eyeballs
- exophthalmic goitre — a form of hyperthyroidism characterized by enlargement of the thyroid gland, protrusion of the eyeballs, increased basal metabolic rate, and weight loss
- finger on the pulse — If you have your finger on the pulse of something, you know all the latest opinions or developments concerning it.
- flowering raspberry — a shrub, Rubus ordoratus, of eastern North America, having loose clusters of showy purplish or rose-purple flowers and inedible, dry, red fruit.
- 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
- gel electrophoresis — a technique for separating protein molecules of varying sizes in a mixture by moving them through a block of gel, as of agarose or polyacrylamide, by means of an electric field, with smaller molecules moving faster and therefore farther than larger ones.
- general partnership — a partnership in which each of the partners is fully liable for the firm's debts.
- general post office — (in the U.S. postal system) the main post office of a city, county, etc., that also has branch post offices. Abbreviation: G.P.O., GPO.
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