20-letter words containing e, n, r, o

northern white cedar — any of several chiefly coniferous trees valued for their wood, especially Chamaecyparis thyoides, of the eastern U.S., or Thuja occidentalis (northern white cedar) of northeastern North America.
norwegian forest cat — a breed of long-haired cat with a long bushy tail and a long mane
not mince your words — If you say that someone does not mince their words, you mean that they speak in a forceful and direct way, especially when saying something unpleasant to someone.
not worth the candle — not worth the price or trouble entailed (esp in the phrase the game's not worth the candle)
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.
occupation franchise — the right of a tenant to vote in national and local elections
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.
ode on a grecian urn — a poem (1819) by Keats.
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
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 course/off course — If a ship or aircraft is on course, it is travelling along the correct route. If it is off course, it is no longer travelling along the correct route.
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 bill of lading — a bill of lading that is issued to the order of a shipper or consignee for delivery of the goods and that can be transferred by endorsement to third parties.
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.
oscillating universe — a variant model of the closed universe in which the universe undergoes cycles of expansion and contraction.
over-intellectualize — to seek or consider the rational content or form of.
overenthusiastically — With excessive enthusiasm.
ovo-lacto vegetarian — a vegetarian who eats eggs and dairy products
ovo-lacto-vegetarian — lacto-ovo-vegetarian.
owner-occupied house — a house that is owned by the person who lives in it
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.
paper qualifications — qualifications gained through official examinations, etc, rather than through experience
pappus of alexandria — 3rd century bc, Greek mathematician, whose eight-volume Synagoge is a valuable source of information about Greek mathematics
para-dichlorobenzene — a white, crystalline, volatile, water-insoluble solid, C 6 H 4 Cl 2 , of the benzene series, having a penetrating odor: used chiefly as a moth repellent.
parametric equations — one of two or more equations expressing the location of a point on a curve or surface by determining each coordinate separately.
parkinson's syndrome — a complex of symptoms indistinguishable from Parkinson's disease, commonly affecting boxers or sometimes occurring as a result of substance abuse or an encephalitic infection.
particle beam weapon — a weapon that fires particle beams into the atmosphere or space

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