18-letter words containing o, a, r, f, i, s
- office of readings — the first of the canonical hours; matins
- official solicitor — an officer of the Supreme Court of Judicature with special responsibilities for protecting the interests of persons under disability
- offset lithography — offset (def 6).
- operating software — software used in the operation of a computer system, typically by performing such tasks as memory allocation, job scheduling, and input/output control
- order of australia — an order awarded to Australians for outstanding achievement or for service to Australia or to humanity at large; established in 1975
- osteitis deformans — Paget's disease.
- overdraft interest — interest charged on money withdrawn in excess of the credit balance of a bank or building society account
- pair of spectacles — a score of 0 in each innings of a match
- pellitory of spain — a small Mediterranean plant, Anacyclus pyrethrum, the root of which contains an oil formerly used to relieve toothache: family Asteraceae (composites)
- percussion flaking — a method of forming a flint tool by striking flakes from a stone core with another stone or a piece of bone or wood.
- performance artist — an artist that is involved in a theatrical presentation that incorporates various art forms, such as dance, sculpture, music, etc
- pilotless aircraft — an aircraft equipped for operation by radio or by robot control, without a human pilot aboard; drone.
- population figures — population totals; statistics relating to the size of populations
- potassium fluoride — a white, crystalline, hygroscopic, toxic powder, KF, used chiefly as an insecticide, a disinfectant, and in etching glass.
- presumption of law — a presumption based upon a policy of law or a general rule and not upon the facts or evidence in an individual case.
- prince of darkness — Satan.
- purchasing officer — the member of staff in an organization who is responsible for buying goods or products
- quality of service — (communications, networking) (QoS) The performance properties of a network service, possibly including throughput, transit delay, priority. Some protocols allow packets or streams to include QoS requirements.
- rabbit's-foot fern — hare's-foot fern.
- radius of gyration — the distance from an axis at which the mass of a body may be assumed to be concentrated and at which the moment of inertia will be equal to the moment of inertia of the actual mass about the axis, equal to the square root of the quotient of the moment of inertia and the mass.
- range of stability — the angle to the perpendicular through which a vessel may be heeled without losing the ability to right itself.
- real-estate office — the place where a real-estate agent works
- reinforced plastic — plastic with fibrous matter, such as carbon fibre, embedded in it to confer additional strength
- restraint of trade — action tending to interrupt the free flow of goods and services, as by price fixing and other practices that have the effect of reducing competition.
- russian federation — a republic extending from E Europe to N and W Asia. 6,593,000 sq. mi. (17,076,000 sq. km). Capital: Moscow.
- safety regulations — regulations or rules that are put in place to ensure a product, event, etc, is safe and not dangerous
- schofield barracks — a town on central Oahu, in central Hawaii.
- school certificate — (in England and Wales between 1917 and 1951 and currently in New Zealand) a certificate awarded to school pupils who pass a public examination: the equivalent of GCSE
- seafloor spreading — a process in which new ocean floor is created as molten material from the earth's mantle rises in margins between plates or ridges and spreads out.
- secondary offering — the sale of a large block of outstanding stock off the floor of an exchange, usually by a major stockholder.
- self-certification — statement of sick leave
- self-contradiction — an act or instance of contradicting oneself or itself.
- self-contradictory — an act or instance of contradicting oneself or itself.
- self-determination — determination by oneself or itself, without outside influence.
- self-fertilization — Botany. fertilization of an ovum of a plant by a male gamete from the same flower (opposed to cross-fertilization).
- self-glorification — a glorified or more splendid form of something.
- self-gratification — the act of pleasing or satisfying oneself, especially the gratifying of one's own impulses, needs, or desires.
- self-incrimination — the act of incriminating oneself or exposing oneself to prosecution, especially by giving evidence or testimony.
- self-instructional — pertaining to or constituting learning materials and conditions arranged so that students can proceed to learn on their own with little or no supervision.
- self-interrogation — the act of interrogating; questioning.
- self-mortification — the inflicting of pain or privation on oneself: He was certain that self-mortification was the only road to salvation.
- self-preoccupation — the state of being preoccupied.
- self-raising flour — flour with baking powder
- self-recrimination — the act of recriminating, or countercharging: Hope gave way to recrimination with both sides claiming the moral high ground.
- senior aircraftman — a rank in the Royal Air Force comparable to that of a private in the army, though not the lowest rank in the Royal Air Force
- skin friction drag — aerodynamic resistance or drag due to the contact of moving air with the surface of an airplane, a glider, etc.
- soda-lime feldspar — plagioclase.
- spirits of ammonia — a 10% solution of ammonia in alcohol
- standard of living — a grade or level of subsistence and comfort in everyday life enjoyed by a community, class, or individual: The well-educated generally have a high standard of living.
- standoff insulator — a type of insulator that supports an electrical conductor at a distance from other elements or surfaces.