20-letter words containing o, t, r

notre dame mountains — a mountain range in E Quebec, Canada, an extension of the Green Mountains in Vermont and a portion of the Appalachian Mountains: about 500 miles (800 km) long, rising about 2000 feet (610 meters).
object role modeling — (programming) (ORM) A conceptual modelling approach that pictures the application world as a set of objects that play roles (parts in relationships, which may be unary, binary or higher order). ORM provides both graphical and textual languages that enable models to be expressed naturally. For data modelling purposes, its graphical language is more expressive than ER or UML.
objective relativism — the doctrine that knowledge of real objects is relative to the individual.
occupation franchise — the right of a tenant to vote in national and local elections
occupation groupings — a system of classifying people according to occupation, based originally on information obtained by government census and subsequently developed by market research. The classifications are used by the advertising industry to identify potential markets. The groups are A, B, C1, C2, D, and E
occupational therapy — a form of therapy in which patients are encouraged to engage in vocational tasks or expressive activities, as art or dance, usually in a social setting.
off the beaten track — formed or shaped by blows; hammered: a dish of beaten brass.
off-the-job training — training which is carried out away from your normal place of work
officer of the guard — an officer, acting under the officer of the day, who is responsible for the instruction, discipline, and performance of duty of the guard in a post, camp, or station. Abbreviation: OG, O.G.
officer of the watch — the officer primarily responsible for the navigation of a ship, in the absence of the captain, during a certain watch.
official secrets act — law: legislation protecting state secret
olfactory anesthesia — absence or loss of the sense of smell.
omega-minus particle — a baryon with strangeness −3, isotopic spin 0, and negative charge; predicted from the mathematics of the Eightfold Way and subsequently discovered. Symbol: Ω −.
on (or off) the air — that is (or is not) broadcasting or being broadcast
on everyone's tongue — prevailing as common gossip
on o's best behavior — If someone is on their best behavior, they are trying very hard to behave well.
on the drawing board — in the planning stage
on the factory floor — in a factory; as a factory worker
on the starboard bow — within 45 degrees to the starboard of straight ahead
one's heart's desire — If you say that someone or something is your heart's desire, you mean that you want that person or thing very much.
one's spiritual home — Your spiritual home is the place where you feel that you belong, usually because your ideas or attitudes are the same as those of the people who live there.
ontological argument — an a priori argument for the existence of God, asserting that as existence is a perfection, and as God is conceived of as the most perfect being, it follows that God must exist; originated by Anselm, later used by Duns Scotus, Descartes, and Leibniz.
open learning centre — an establishment which provides further education on a flexible part-time basis
operant conditioning — conditioning (def 1).
operating conditions — Operating conditions are a set of conditions for operating a particular system or process.
operation barbarossa — the codename for Hitler's invasion (1941) of Russia
operational calculus — a method for solving a differential equation by treating differential operators as ordinary algebraic quantities, thus obtaining a simpler problem.
operational database — (database) A database containing up-to-date, modifiable data, in contrast to a decision support database.
operational strategy — a plan or set of plans for successfully running a business, etc
operator overloading — overloading
ophthalmodynamometer — a device for determining the nearest point of ocular convergence.
optical mark reading — the reading of marks by an optical device whereby the information can be stored in machine-readable form
order of the thistle — an ancient Scottish order of knighthood revived by James VII of Scotland in 1687. It consists of the sovereign, 16 knights brethren, and extra members created by statute. It is the equivalent of the Order of the Garter, and is usually conferred on Scots
organization expense — the costs associated with organizing a business entity and bringing it into existence
orthognathic surgery — the surgical correction of deformities or malpositions of the jaw.
orthopaedic mattress — a specially firm mattress designed to help correct or ameliorate the discomfort of disorders of the spine and joints
orthophosphoric acid — a colorless, crystalline solid, H 3 PO 4 , the tribasic acid of pentavalent phosphorus: used chiefly in fertilizers, as a source of phosphorus salts, and in soft drinks as an acidulant and flavoring agent.
oscillating universe — a variant model of the closed universe in which the universe undergoes cycles of expansion and contraction.
ousterhout's fallacy — Ousterhout's dichotomy
over-intellectualize — to seek or consider the rational content or form of.
overenthusiastically — With excessive enthusiasm.
overseer of the poor — a minor official of a parish attached to the workhouse or poorhouse
ovo-lacto vegetarian — a vegetarian who eats eggs and dairy products
ovo-lacto-vegetarian — lacto-ovo-vegetarian.
paint the town (red) — to go on a boisterous spree; carouse
pale western cutworm — the larva of a noctuid moth, Agrotis orthogonia, of the western U.S. and Canada, that seriously damages grains, beets, potatoes, alfalfa, etc., by feeding underground on roots and stems.
palos verdes estates — a town in S California.
paper chromatography — the separation of mixtures into their constituents by preferential adsorption by a solid, as a column of silica (column chromatography) or a strip of filter paper (paper chromatography) or by a gel.
paper qualifications — qualifications gained through official examinations, etc, rather than through experience
parallel of altitude — almucantar.

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