20-letter words containing a, c, o, r

spherical aberration — variation in focal length of a lens or mirror from center to edge, due to its spherical shape.
spherical coordinate — Usually, spherical coordinates. any of three coordinates used to locate a point in space by the length of its radius vector and the angles this vector makes with two perpendicular polar planes.
spiral of archimedes — a curve that is the locus of a point that moves outward with uniform speed along a vector, beginning at the origin, while the vector rotates about the origin with uniform angular velocity. Equation (in polar coordinates): r = aθ.
spontaneous recovery — the reappearance of a response after its extinction has been followed by a period of rest
spotted crane's-bill — the American wild geranium, Geranium maculatum.
square cross-section — If a kelly has a square cross-section, it has a surface area with four equal sides, when looked at as if has been sliced through.
st. george's channel — a channel between Wales and Ireland, connecting the Irish Sea and the Atlantic. 100 miles (160 km) long; 50–90 miles (81–145 km) wide.
states of the church — Papal States
step into the breach — If you step into the breach, you do a job or task which someone else was supposed to do or has done in the past, because they are suddenly unable to do it.
stochastic terrorism — the public demonization of a person or group resulting in the incitement of a violent act, which is statistically probable but whose specifics cannot be predicted: The lone-wolf attack was apparently influenced by the rhetoric of stochastic terrorism.
stoichiometric ratio — The stoichiometric ratio is the exact ratio between air and flammable gas or vapor at which complete combustion takes place.
straight-cut tobacco — tobacco that is cut in such a way that it will lie flat.
stress concentration — A stress concentration in a solid is a place where there is a lot of stress, either because a force is applied in a particular area or there is a change in the cross-sectional area.
strong nuclear force — an interaction between elementary particles responsible for the forces between nucleons in the nucleus. It operates at distances less than about 10–15 metres, and is about a hundred times more powerful than the electromagnetic interaction
structural isomerism — Chemistry. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism) as CH 3 OCH 3 and CH 3 CH 2 OH, or in the arrangement of their atoms in space and therefore in one or more properties. Compare optical isomerism, stereoisomerism.
subscription library — a commercial lending library
summary jurisdiction — the right a court has to adjudicate immediately upon some matter arising during its proceedings
supersonic transport — a commercial jet airplane that can fly faster than the speed of sound. Abbreviation: SST.
surveillance society — a society where surveillance technology is widely used to monitor people's everyday activities
switchboard operator — a person who operates an installation in a telephone exchange, office, hotel, etc, at which the interconnection of telephone lines is manually controlled
synchronized skating — the art or sport of teams of up to twenty skaters holding onto each other and moving in patterns in time to music
synchronous rotation — rotation of a satellite in which the period of rotation is equal to the period of orbit around its primary, leaving the same face always pointing toward the primary: The moon is in synchronous rotation about the earth.
systemic circulation — the circulatory system in general.
tactical air command — a U.S. Air Force command supplying direct air support to U.S. Army ground combat units.
take to the cleaners — a person who cleans, especially one whose regular occupation is cleaning offices, buildings, equipment, etc.
technology agreement — a framework designed by trade unions for negotiating changes in employment caused by the introduction of new technology
teletype corporation — (company) The company which made Teletype teletypewriters. Address: Skokie, Illinois, USA.
television broadcast — sth shown on tv
terms and conditions — commerce: rules, restrictions
tetrahydrocannabinol — a compound, C 21 H 30 O 2 , that is the physiologically active component in cannabis preparations (marijuana, hashish, etc.) derived from the Indian hemp plant or produced synthetically. Abbreviation: THC.
the course of nature — the ordinary course of events
the grove of academe — the academic world
the internet account — An Internet provider in Sydney, Australia who provides SLIP, PPP and CLI accounts for the same rates. <[email protected]> handles Acorn software. E-mail: <[email protected]>. Telephone: +61 (2) 968 4333. Fax: +61 (2) 968 4334. Address: PO BOX 473, Crows Nest, NSE 2065, Australia.
the luck of the draw — If you say that something is the luck of the draw, you mean that it is the result of chance and you cannot do anything about it.
the way of the cross — a series of images in a church or along a road to a church etc depicting the last hours of Christ
therapeutic abortion — abortion performed when a woman's pregnancy endangers her health.
there is no call for — If you say that there is no call for someone to behave in a particular way, you are criticizing their behaviour, usually because you think it is rude.
thermal conductivity — the amount of heat per unit time per unit area that can be conducted through a plate of unit thickness of a given material, the faces of the plate differing by one unit of temperature.
thermodynamic system — a system whose states of equilibrium can be specified by a few macroscopic properties.
thomas of erceldoune — Thomas of, Thomas of Erceldoune.
thought transference — transference of thought by extrasensory means from the mind of one individual to another; telepathy.
three-thorned acacia — honey locust.
to catch your breath — If something makes you catch your breath, it makes you take a short breath of air, usually because it shocks you.
to clean up your act — If someone who has been behaving badly cleans up their act, they start to behave in a more acceptable or responsible way.
to clear your throat — If you clear your throat, you cough once in order to make it easier to speak or to attract people's attention.
to cost someone dear — If something that someone does costs them dear, they suffer a lot as a result of it.
to disturb the peace — If someone is accused of disturbing the peace, they are accused of behaving in a noisy and offensive way in public.
to get your own back — If you get your own back on someone, you have your revenge on them because of something bad that they have done to you.
to keep your balance — If you keep your balance, for example, when standing in a moving vehicle, you remain steady and do not fall over. If you lose your balance, you become unsteady and fall over.
to reach new heights — to become higher than ever before

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