22-letter words containing r, i, d, l, e
- database normalisation — (database) A series of steps followed to obtain a database design that allows for efficient access and storage of data in a relational database. These steps reduce data redundancy and the chances of data becoming inconsistent. A table in a relational database is said to be in normal form if it satisfies certain constraints. Codd's original work defined three such forms but there are now five generally accepted steps of normalisation. The output of the first step is called First Normal Form (1NF), the output of the second step is Second Normal Form (2NF), etc. First Normal Form eliminates repeating groups by putting each value of a multi-valued attribute into a new row. Second Normal Form eliminates functional dependencies on a partial key by putting the fields in a separate table from those that are dependent on the whole key. Third Normal Form eliminates functional dependencies on non-key fields by putting them in a separate table. At this stage, all non-key fields are dependent on the key, the whole key and nothing but the key. Fourth Normal Form separates independent multi-valued facts stored in one table into separate tables. Fifth Normal Form breaks out data redundancy that is not covered by any of the previous normal forms.
- de broglie wave length — the postulate of wave mechanics that a particle of mass m moving at a velocity v will have the properties of a wave of wavelength h / mv (de Broglie wavelength) where h is Planck's constant.
- decompartmentalization — the act of decompartmentalizing
- delaunay triangulation — (mathematics, graphics) (After B. Delaunay) For a set S of points in the Euclidean plane, the unique triangulation DT(S) of S such that no point in S is inside the circumcircle of any triangle in DT(S). DT(S) is the dual of the voronoi diagram of S.
- delayed-action shutter — a camera shutter that opens after an interval set by the photographer
- deoxyribonucleoprotein — any of a class of nucleoproteins that yield DNA upon partial hydrolysis.
- descriptive cataloging — the aspect of cataloging concerned with the bibliographic and physical description of a book, recording, or other work, accounting for such items as author or performer, title, edition, and imprint as opposed to subject content.
- developmental disorder — any condition, such as autism or dyslexia, that appears in childhood and is characterized by delay in the development of one or more psychological functions, such as language skill
- devil's darning needle — dragonfly
- dicyclopentadienyliron — ferrocene (def 1).
- diethylbarbituric acid — barbital
- digital control system — (systems) (DCS) A digital computer used for real-time control of a dynamic system, usually in an industrial environment, possibly as part of a Supervisory Control and Data Acquisition (SCADA) system. A DCS samples feedback from the system under control and modifies the control signals in an attempt to achieve some desired behaviour. Analysis of such digital-analogue feedback systems can involve mathematical methods such as difference equations, Laplace transforms, z transfer functions, state space models and state transition matrices.
- digital radio mondiale — (communications) (DRM) A form of monaural digital broadcast using carrier frequencies below 30 MHz. DRM uses MPEG-4 AAC Main Profile and SBR at data rates of 16-25 kbps.
- digital versatile disc — (storage) (DVD, formerly "Digital Video Disc") An optical storage medium with improved capacity and bandwidth compared with the Compact Disc. DVD, like CD, was initally marketed for entertainment and later for computer users. [When was it first available?] A DVD can hold a full-length film with up to 133 minutes of high quality video, in MPEG-2 format, and audio. The first DVD drives for computers were read-only drives ("DVD-ROM"). These can store 4.7 GBytes - over seven times the storage capacity of CD-ROM. DVD-ROM drives read existing CD-ROMs and music CDs and are compatible with installed sound and video boards. Additionally, the DVD-ROM drive can read DVD films and modern computers can decode them in software in real-time. The DVD video standard was announced in November 1995. Matshusita did much of the early development but Philips made the first DVD player, which appeared in Japan in November 1996. In May 2004, Sony released the first dual-layer drive, which increased the disc capacity to 8.5 GB. Double-sided, dual-layer discs will eventually increase the capacity to 17 GB. Write-once DVD-R ("recordable") drives record a 3.9GB DVD-R disc that can be read on a DVD-ROM drive. Pioneer released the first DVD-R drive on 1997-09-29. By March 1997, Hitachi had released a rewritable DVD-RAM drive (by false analogy with random-access memory). DVD-RAM drives read and write to a 2.6 GB DVD-RAM disc, read and write-once to a 3.9GB DVD-R disc, and read a 4.7 GB or 8.5 GB DVD-ROM. Later, DVD-RAM discs could be read on DVD-R and DVD-ROM drives.
- digital video recorder — See DVR.
- dihydroxyphenylalanine — dopa.
- dilation and curettage — a surgical method for the removal of diseased tissue or an early embryo from the lining of the uterus by means of scraping.
- direct public offering — A direct public offering is stock offered directly for sale to investors by a company without the use of underwriters or brokers.
- directed acyclic graph — (DAG) A directed graph containing no cycles. This means that if there is a route from node A to node B then there is no way back.
- directional derivative — the limit, as a function of several variables moving along a given line from one specified point to another on the line, of the difference in the functional values at the two points divided by the distance between the points.
- directional microphone — a microphone that has a greater sensitivity to sounds coming from a particular area in front of it: used to eliminate unwanted sounds.
- disciplinary committee — a committee charged with examining alleged breaches of discipline within an organization, profession, etc and adjudicating on them
- dishonorable discharge — the discharge of a person from military service for an offense more serious than one for which a bad-conduct discharge is given.
- disposable soma theory — the theory that ageing is caused by the body having increasingly fewer resources to allocate towards repairing wear and damage to tissues
- drive-through delivery — childbirth after which the mother has a very brief hospital stay.
- drumhead court-martial — a court-martial held, usually on a battlefield, for the summary trial of charges of offenses committed during military operations.
- earn one's daily bread — to earn one's living
- end transmission block — (character) (ETB) The mnemonic for ASCII character 23.
- equal rights amendment — a proposed amendment to the US Constitution enshrining equality between the sexes
- experimental condition — one of the distinct states of affairs or values of the independent variable for which the dependent variable is measured in order to carry out statistical tests or calculations
- federal crop insurance — insurance against the failure of certain crops provided to farmers and producers by the Federal Government
- federal district court — district court (def 2).
- federal maritime board — the body responsible for regulating commerce by US and international shipping in US waters
- ferdinand von zeppelin — Count Ferdinand von [fer-di-nahnt fuh n] /ˈfɛr dɪˌnɑnt fən/ (Show IPA), 1838–1917, German general and aeronaut: designer and manufacturer of the zeppelin.
- financial underwriting — Financial underwriting is the process of assessing whether the proposed sum insured and product are reasonable when considering the possible financial loss to the client.
- fitzgerald contraction — the hypothesis that a moving body exhibits a contraction in the direction of motion when its velocity is close to the speed of light.
- forced place insurance — Forced place insurance is insurance taken out by a bank or creditor on an uninsured debtor's behalf on a property that is being used as collateral.
- gallamine triethiodide — a neuromuscular blocking drug, C 30 H 60 I 3 N 3 O 3 , similar to curare, used as a skeletal muscle relaxant in conjunction with surgical anesthesia.
- generalized coordinate — Usually, generalized coordinates. one of a minimum set of coordinates needed to specify the state or position of a given system.
- gloria in excelsis deo — the hymn beginning, in Latin, Gloria in Excelsis Deo, “Glory in the highest to God,” and in the English version, “Glory be to God on high.”.
- golden-crowned kinglet — a yellowish-green kinglet, Regulus satrapa, of North America, having a yellow or orange patch on the top of the head.
- gravitational redshift — (in general relativity) the shift toward longer wavelengths of electromagnetic radiation emitted by a source in a gravitational field, especially at the surface of a massive star.
- green around the gills — the respiratory organ of aquatic animals, as fish, that breathe oxygen dissolved in water.
- gridiron-tailed lizard — zebra-tailed lizard.
- guided missile cruiser — a naval cruiser equipped with long-range guided missiles and missile launchers.
- hammersmith and fulham — a borough of Greater London on the River Thames: established in 1965 by the amalgamation of Fulham and Hammersmith. Pop: 174 200 (2003 est). Area: 16 sq km (6 sq miles)
- hold the purse strings — hold the purse strings, to have the power to determine how money shall be spent.
- hook, line, and sinker — a curved or angular piece of metal or other hard substance for catching, pulling, holding, or suspending something.
- horn-rimmed spectacles — spectacles with rims made of material resembling horn
- hybrid multiprocessing — (parallel) (HMP) The kind of multitasking which OS/2 supports. HMP provides some elements of symmetric multiprocessing, using add-on IBM software called MP/2. OS/2 SMP was planned for release in late 1993.