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18-letter words containing a, s, t

  • depth-first search — (algorithm)   A graph search algorithm which extends the current path as far as possible before backtracking to the last choice point and trying the next alternative path. Depth-first search may fail to find a solution if it enters a cycle in the graph. This can be avoided if we never extend a path to a node which it already contains. Opposite of breadth first search. See also iterative deepening.
  • desalination plant — a factory where salt is removed from salt water in order to make the water suitable for drinking and irrigation
  • descriptive clause — a relative clause that describes or supplements but is not essential in establishing the identity of the antecedent and is usually set off by commas in English. In This year, which has been dry, is bad for crops the clause which has been dry is a nonrestrictive clause.
  • destruct mechanism — a mechanism that causes the destruction of a rocket or missile when activated
  • detective sergeant — a police officer who investigates crime and who ranks above a detective constable but below a detective inspector
  • devil's paintbrush — a perennial European hawkweed (Hieracium aurantiacum) with leafless flower stalks bearing a cluster of orange-red heads: now a common weed in N U.S. and Canada
  • dia de los muertos — Day of the Dead.
  • diabetes insipidus — a disorder of the pituitary gland causing excessive thirst and excretion of large quantities of dilute urine
  • diagnostic testing — Diagnostic testing is the testing of a vehicle, or one of its systems or parts, in order to identify why it is not working properly.
  • dialytic telescope — a type of achromatic telescope with a second correcting lens
  • diastereoisomerism — (chemistry) Any form of stereoisomerism other than enantiomerism.
  • diatomaceous earth — an unconsolidated form of diatomite
  • dicalcium silicate — a component of cement, 2CaO⋅SiO 2 , also used to neutralize acid soils.
  • dietary supplement — a substance taken in addition to what you eat in order to promote health
  • digital humanities — (used with a singular verb) the study of literature, philosophy, etc., as facilitated by computer technology or digital media: Digital humanities uses data analysis to find patterns in large bodies of text. the set of methodologies used in such scholarship.
  • digital signatures — digital signature
  • digital switchover — the process of changing the method of transmitting television from analogue to digital format
  • digital television — a television broadcasting technology in which signals are transmitted as a sequence of binary numbers.
  • digital video disc — Digital Versatile Disc
  • dihydrotachysterol — a white, crystalline, water-insoluble sterol, C 28 H 46 O, derived from ergosterol: used chiefly in the treatment of hypoparathyroidism.
  • dimensionalisation — Alternative spelling of dimensionalization.
  • dimensionalization — The process of dimensionalizing.
  • diphosphoglycerate — an ester of phosphoric acid and glyceric acid that occurs in the blood and that promotes the release of hemoglobin-bound oxygen.
  • diplomatic service — diplomatic corps
  • diplomatic shuttle — a series of diplomatic visits to other states made by an official, such as an ambassador or envoy
  • directional signal — any of four signal lights on the front left, front right, rear left, and rear right of an automotive vehicle that, when actuated by the driver, flash in pairs on the side toward which a turn is to be made.
  • disability pension — a pension paid to people who are unable to continue to work because of a disability
  • discharge printing — a fabric-printing method in which the material is dyed and then certain areas are discharged so as to permit the original hue or its color replacement to act as a pattern against the colored ground.
  • disenfranchisement — to disfranchise.
  • disidentifications — Plural form of disidentification.
  • disodium phosphate — sodium phosphate (def 2).
  • dispatch documents — documents sent with a parcel, etc, detailing information such as contents, delivery address, etc
  • dispersible tablet — A dispersible tablet is a tablet that disintegrates in water or other liquid.
  • display postscript — An extended form of PostScript permitting its interactive use with bitmap displays.
  • disproportionality — not in proportion; disproportionate.
  • disproportionately — not proportionate; out of proportion, as in size or number.
  • disproportionation — the simultaneous oxidation and reduction of a substance reacting with itself, thereby forming two dissimilar molecules, as 2C 2 H 4 →C 2 H 6 +C 2 H 2 .
  • distance education — education in which students receive instruction over the Internet, from a video, etc., instead of going to school.
  • distinguishability — to mark off as different (often followed by from or by): He was distinguished from the other boys by his height.
  • distracted driving — driving a vehicle while engaging in an activity that has the potential to distract the driver from the task of driving: Bans on cell phone use in cars will help to reduce the dangers of distracted driving.
  • distribution class — form class
  • distribution ratio — the ratio of concentrations of a solute distributed between two immiscible solvents in contact with each other, as iodine in water and chloroform
  • divine inspiration — insight provided by higher power
  • division algorithm — the theorem that an integer can be written as the sum of the product of two integers, one a given positive integer, added to a positive integer smaller than the given positive integer. Compare Euclidean algorithm.
  • domain name system — (networking)   (DNS) A general-purpose distributed, replicated, data query service chiefly used on Internet for translating hostnames into Internet addresses. Also, the style of hostname used on the Internet, though such a name is properly called a fully qualified domain name. DNS can be configured to use a sequence of name servers, based on the domains in the name being looked for, until a match is found. The name resolution client (e.g. Unix's gethostbyname() library function) can be configured to search for host information in the following order: first in the local hosts file, second in NIS and third in DNS. This sequencing of Naming Services is sometimes called "name service switching". Under Solaris is configured in the file /etc/nsswitch.conf. DNS can be queried interactively using the command nslookup. It is defined in STD 13, RFC 1034, RFC 1035, RFC 1591.
  • domestic appliance — a machine used for household tasks, for example, a washing machine, refrigerator, etc.
  • donor insemination — a process which involves using sperm which has been voluntarily given for use in the insemination of another person
  • drainpipe trousers — trousers with very narrow legs
  • dressing table set — a set including a hairbrush, mirror and comb, often with silver backs
  • driver's education — high-school driving classes
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