18-letter words containing r, a, d, i, o, s
- closed scholarship — a scholarship for which only certain people, such as those from a particular school or with a particular surname, are eligible
- coastguard station — the headquarters or local offices of a coastguard
- collision diameter — the distance between the centers of two colliding molecules when at their closest point of approach.
- compensation award — an amount of money awarded as compensation in a court case
- compensation order — (in Britain) the requirement of a court that an offender pay compensation for injury, loss, or damage resulting from an offence, either in preference to or as well as a fine
- concussion grenade — a grenade designed to inflict damage by the force of its detonation rather than by the fragmentation of its casing.
- condensation trail — contrail.
- conservation grade — relating to food produced using traditional methods where possible, and following strict specifications regarding animal feeds and welfare, the use of chemical fertilizers, wildlife conservation, and land management
- considered harmful — (programming, humour) A type of phrase based on the title of Edsger W. Dijkstra's famous note in the March 1968 Communications of the ACM, "Goto Statement Considered Harmful", which fired the first salvo in the structured programming wars. Amusingly, the ACM considered the resulting acrimony sufficiently harmful that it will (by policy) no longer print articles taking so assertive a position against a coding practice. In the ensuing decades, a large number of both serious papers and parodies bore titles of the form "X considered Y". The structured-programming wars eventually blew over with the realisation that both sides were wrong, but use of such titles has remained as a persistent minor in-joke.
- contact dermatitis — dermatitis caused by direct contact with an irritating substance, as an allergen or chemical
- contradistinctions — Plural form of contradistinction.
- countryside agency — (in England) a government agency that promotes the conservation and enjoyment of the countryside and aims to stimulate employment in rural areas
- creme de framboise — a liqueur flavored with raspberries.
- crested dog's-tail — a common wiry perennial grass, Cynosurus cristatus, of meadows and pasture
- crookes radiometer — a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side. The vanes are mounted on a vertical axis and revolve when light, or other radiant energy, falls on them
- cross-disciplinary — linking two or more fields of study
- crude oil desalter — A crude oil desalter is equipment which removes inorganic salts from crude oil, using chemical or electrostatic separation.
- cultural diffusion — act of diffusing; state of being diffused.
- dead as a doornail — completely dead
- deanthropomorphism — the ridding of philosophy or religion of anthropomorphic beliefs and doctrines.
- dechristianization — The act of dechristianizing; the systematic removal of Christianity or Christian elements.
- depository library — a library designated by law to receive without charge all or a selection of the official publications of a government.
- dia de los muertos — Day of the Dead.
- diaminofluorescein — (organic compound) A fluorescein into which two amino groups have been substituted.
- diastereoisomerism — (chemistry) Any form of stereoisomerism other than enantiomerism.
- diatomaceous earth — an unconsolidated form of diatomite
- digital switchover — the process of changing the method of transmitting television from analogue to digital format
- dihydrotachysterol — a white, crystalline, water-insoluble sterol, C 28 H 46 O, derived from ergosterol: used chiefly in the treatment of hypoparathyroidism.
- 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
- 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.
- discourse analysis — the study of the rules or patterns characterizing units of connected speech or writing longer than a sentence.
- 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 .
- 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.
- division of labour — a system of organizing the manufacture of an article in a series of separate specialized operations, each of which is carried out by a different worker or group of workers
- domain name server — (spelling) Domain Name System.
- 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
- driver's education — high-school driving classes
- dwarf storage unit — (humour) (DSU) An IBM term for a cupboard.
- electoral district — an area that is considered as unit for the purposes of an election
- electrocardiograms — Plural form of electrocardiogram.
- electrodesiccation — The drying of tissue, and the prevention of bleeding, using a high-frequency electric current.
- eraser stains code — (humour, programming) Code that has been refactored many times, leaving swaths of legacy code and design; like paper that has been written on and erased so many times that the pencil marks are no longer the problem - the large greasy stain is.