17-letter words containing d, i, t, r
- finite difference — difference (def 9c).
- first commandment — “Thou shalt have no other gods before me”: first of the Ten Commandments.
- first-aid classes — classes which teach people how to give immediate medical help in an emergency
- first-degree burn — a burned place or area: a burn where fire had ripped through the forest.
- first-order logic — (language, logic) The language describing the truth of mathematical formulas. Formulas describe properties of terms and have a truth value. The following are atomic formulas: True False p(t1,..tn) where t1,..,tn are terms and p is a predicate. If F1, F2 and F3 are formulas and v is a variable then the following are compound formulas: The "order" of a logic specifies what entities "For all" and "Exists" may quantify over. First-order logic can only quantify over sets of atomic propositions. (E.g. For all p . p => p). Second-order logic can quantify over functions on propositions, and higher-order logic can quantify over any type of entity. The sets over which quantifiers operate are usually implicit but can be deduced from well-formedness constraints. In first-order logic quantifiers always range over ALL the elements of the domain of discourse. By contrast, second-order logic allows one to quantify over subsets.
- flagrante delicto — Law. in the very act of committing the offense.
- floating dry dock — a dock that floats and can be lowered in the water for the entrance of a ship, and then raised for use as a dry dock
- fluid lubrication — lubrication in which bearing surfaces are separated by an oil film sustained by the motion of the parts
- forced convection — Forced convection is convection in which the movement of fluid does not happen naturally but is helped by a device such as a fan or pump.
- fore-and-aft sail — any of various sails, as jib-headed sails, gaff sails, lugsails, lateen sails, spritsails, staysails, and jibs, that do not set on yards and whose normal position, when not trimmed, is in a fore-and-aft direction amidships.
- forward quotation — the price quoted on a forward delivery.
- foundation course — A foundation course is a course that you do at some colleges and universities in order to prepare yourself for a longer or more advanced course.
- fractal dimension — (mathematics) A common type of fractal dimension is the Hausdorff-Besicovich Dimension, but there are several different ways of computing fractal dimension. Fractal dimension can be calculated by taking the limit of the quotient of the log change in object size and the log change in measurement scale, as the measurement scale approaches zero. The differences come in what is exactly meant by "object size" and what is meant by "measurement scale" and how to get an average number out of many different parts of a geometrical object. Fractal dimensions quantify the static *geometry* of an object. For example, consider a straight line. Now blow up the line by a factor of two. The line is now twice as long as before. Log 2 / Log 2 = 1, corresponding to dimension 1. Consider a square. Now blow up the square by a factor of two. The square is now 4 times as large as before (i.e. 4 original squares can be placed on the original square). Log 4 / log 2 = 2, corresponding to dimension 2 for the square. Consider a snowflake curve formed by repeatedly replacing ___ with _/\_, where each of the 4 new lines is 1/3 the length of the old line. Blowing up the snowflake curve by a factor of 3 results in a snowflake curve 4 times as large (one of the old snowflake curves can be placed on each of the 4 segments _/\_). Log 4 / log 3 = 1.261... Since the dimension 1.261 is larger than the dimension 1 of the lines making up the curve, the snowflake curve is a fractal. [sci.fractals FAQ].
- frankenstein food — any foodstuff that has been genetically modified
- freight forwarder — a person or firm that arranges to pick up or deliver goods on instructions of a shipper or a consignee from or to a point by various necessary conveyances and common carriers.
- friend of dorothy — a male homosexual
- from side to side — movement: back and forth
- front-wheel drive — a drive system in which engine power is transmitted through the front wheels only.
- further education — adult education.
- garden heliotrope — the common valerian, Valeriana officinalis, especially when cultivated as an ornamental.
- garden mignonette — a Mediterranean plant, Resida odorata, which has spikes of small greenish-white flowers with prominent anthers
- generalized other — an individual's internalized impression of societal norms and expectations.
- george whitefield — George, 1714–70, English Methodist evangelist.
- giscard d'estaing — Valéry [va-ley-ree] /va leɪˈri/ (Show IPA), born 1926, French political leader: president 1974–81.
- give to the world — to publish
- go down the drain — to withdraw or draw off (a liquid) gradually; remove slowly or by degrees, as by filtration: to drain oil from a crankcase.
- gold export point — an exchange rate at which it is as cheap to settle international accounts by exporting gold bullion as by buying bills of exchange
- gold import point — an exchange rate at which it is as cheap to settle international accounts by importing gold bullion as by selling bills of exchange
- goldbeater's skin — the prepared outside membrane of the large intestine of the ox, used by goldbeaters to lay between the leaves of the metal while they beat it into gold leaf.
- good-time charlie — an affable, sociable, pleasure-loving man.
- graduated pension — the money that an employee receives after retirement if they have paid into the graduated pension scheme
- grand climacteric — Physiology. a period of decrease of reproductive capacity in men and women, culminating, in women, in the menopause.
- grand touring car — GT (def 2).
- grandstand finish — a close or exciting ending to a sports match or competition
- greater celandine — celandine (def 1).
- green-winged teal — a small freshwater duck, Anas crecca, of Eurasia and North America, having an iridescent green speculum in the wing.
- greenland halibut — a flatfish, Reinhardtius hippoglossoides, similar and related to the halibut
- grignard reaction — the reaction of a Grignard reagent with any of the numerous types of compounds with which it can combine, as alcohols, acids, aldehydes, ketones, or esters: used chiefly in organic synthesis.
- grooved fricative — a fricative, as (s), in which air is channeled through a groove along the center of the tongue.
- ground connection — the conductor used to establish a ground.
- guardian ad litem — a person appointed by a court as guardian of an infant or other person to act on his or her behalf in a particular action or proceeding.
- haemorrhoidectomy — surgical removal of haemorrhoids
- hairy-tailed mole — a blackish North American mole, Parascalops breweri, having a short, hairy tail.
- handicap register — a list of the disabled people in its area that a local authority had a duty to compile under the Chronically Sick and Disabled Persons Act 1970
- hardware register — (hardware, system administration) (Or "hardware log") A list of all hardware, both internal and external, that is attached to a particular computer.
- hawking radiation — the emission of particles by a black hole. Pairs of virtual particles in the intense gravitational field around a black hole may live long enough for one to move outward when the other is pulled into the black hole, making it appear that the black hole is emitting radiation
- head of the river — any of various annual rowing regattas held on particular rivers
- heritage industry — an industry that manages the historical sites, buildings, and museums in a particular place, with the aim of encouraging tourism
- hermaphrodite rig — jackass rig.
- historical method — the process of establishing general facts and principles through attention to chronology and to the evolution or historical course of what is being studied.