19-letter words containing n, e, r, d, o
- dielectric constant — Electricity. the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum.
- difference equation — (mathematics) A relation between consecutive elements of a sequence. The first difference is D u(n) = u(n+1) - u(n) where u(n) is the nth element of sequence u. The second difference is u(n+2) + a u(n+1) + b u(n) = 0 can be converted to a difference equation (in this case, a second order linear difference equation): D2 u(n) + p D u(n) + q u(n) = 0 and vice versa. a, b, p, q are constants.
- 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.
- dig one's own grave — If you say that someone is digging their own grave, you are warning them that they are doing something foolish or dangerous that will cause their own failure.
- digital electronics — (electronics) The implementation of two-valued logic using electronic logic gates such as and gates, or gates and flip-flops. In such circuits the logical values true and false are represented by two different voltages, e.g. 0V for false and +5V for true. Similarly, numbers are normally represented in binary using two different voltages to represented zero and one. Digital electronics contrasts with analogue electronics which represents continuously varying quantities like sound pressure using continuously varying voltages. Digital electronics is the foundation of modern computers and digital communications. Massively complex digital logic circuits with millions of gates can now be built onto a single integrated circuit such as a microprocessor and these circuits can perform millions of operations per second.
- 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.
- dihydrotestosterone — (steroid) An androgenic metabolite of testosterone; used to treat certain breast cancers.
- dimethylnitrosamine — a yellow, water-soluble carcinogenic liquid, C 2 H 6 N 2 O, found in tobacco smoke and certain foods: known to be a potent carcinogen. Abbreviation: DMN, DMNA.
- 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 grant school — (in Britain, formerly) a school financed by endowment, fees, and a state grant conditional upon admittance of a percentage of nonpaying pupils nominated by the local education authority
- direct-vision prism — Amici prism.
- direction indicator — aerial used in wireless communication
- 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).
- directory enquiries — Directory enquiries is a service which you can telephone to find out someone's telephone number.
- discretionary trust — a trust in which the beneficiaries' shares are not fixed in the trust deed but are left to the discretion of other persons, often the trustees
- discriminated union — (theory) The discriminated union of two sets A and B is A + B = {(inA, a) | a in A} U {(inB, b)| b in B} where inA and inB are arbitrary tags which specify which summand an element originates from. A type (especially an algebraic data type) might be described as a discriminated union if it is a sum type whose objects consist of a tag to say which part of the union they belong to and a value of the corresponding type.
- disjunctive pronoun — an inflection of pronouns in some languages that is used alone or after a preposition, such as moi in French
- 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
- distribution system — The distribution system is the part of an electric system after the transmission system that is dedicated to delivering electric energy to an end user.
- diversional therapy — the structured use of leisure time in recreation and play as a form of or supplement to conventional therapy
- do well for oneself — to thrive or succeed
- doctrine of descent — the theory that animals and plants arose by descent from previously existing organisms; theory of evolution
- domain architecture — (systems analysis) A generic, organisational structure or design for software systems in a domain. The domain architecture contains the designs that are intended to satisfy requirements specified in the domain model. A domain architecture can be adapted to create designs for software systems within a domain and also provides a framework for configuring assets within individual software systems.
- dominance hierarchy — a system or set of relationships in animal groups that is based on a hierarchical ranking, usually established and maintained by behavior in aggressive encounters: one or a few members hold the highest rank and the others are submissive to those ranking higher and dominant to those ranking lower.
- don the baggy green — to represent Australia at Test cricket
- 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.
- draw in one's horns — one of the bony, permanent, hollow paired growths, often curved and pointed, that project from the upper part of the head of certain ungulate mammals, as cattle, sheep, goats, or antelopes.
- draw someone's fire — to attract the criticism or censure of someone
- draw the color line — to impose or accept the color line
- draw the curtain on — to end
- drawing-room comedy — a light, sophisticated comedy typically set in a drawing room with characters drawn from polite society.
- dred scott decision — Barbara Ann, 1928–2012, Canadian figure skater.
- drink the health of — to salute or celebrate with a toast
- dwight d eisenhower — Dwight David ("Ike") 1890–1969, U.S. general and statesman: Chief of Staff 1945–48; 34th president of the U.S. 1953–61.
- east dunbartonshire — a council area of central Scotland to the N of Glasgow: part of Strathclyde region from 1975 until 1996: mainly agricultural and residential. Administrative centre: Kirkintilloch. Pop: 106 970 (2003 est). Area: 172 sq km (66 sq miles)
- educational adviser — a person who provides advice and training to teachers about teaching methods and educational policies
- elastic deformation — In elastic deformation a material changes shape when a stress is applied to it but goes back to its original state when the stress is removed.
- electroconductivity — Electrical conductivity.
- electrode potential — the potential difference developed when an electrode of an element is placed in a solution containing ions of that element
- electrodynamometers — Plural form of electrodynamometer.
- electrohydrodynamic — (physics) Of or pertaining to electrohydrodynamics.
- electronic keyboard — a typewriter keyboard used to operate an electronic device such as a computer, word processor, etc
- 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
- end of transmission — (character) (EOT) The mnemonic for ASCII character 4.
- endowment assurance — a form of life insurance that provides for the payment of a specified sum directly to the policyholder at a designated date or to his beneficiary should he die before this date
- endowment insurance — Endowment insurance is a type of life insurance that pays a particular sum directly to the policyholder at a stated date, or to a beneficiary if the policyholder dies before this date.
- environmental audit — the systematic examination of an organization's interaction with the environment, to assess the success of its conservation or antipollution programme
- error-based testing — (programming) Testing where information about programming style, error-prone language constructs, and other programming knowledge is applied to select test data capable of detecting faults, either a specified class of faults or all possible faults.
- euclidean algorithm — Euclid's Algorithm