21-letter words containing a, t, v

relative permeability — the ratio of the permeability of a medium to that of free space
relative permittivity — Electricity. the ratio of the flux density produced by an electric field in a given dielectric to the flux density produced by that field in a vacuum.
reverberation chamber — a room with walls that reflect sound. It is used to make acoustic measurements and as a source of reverberant sound to be mixed with direct sound for recording or broadcasting
reverberatory furnace — See at reverberatory (def 2).
reverse polish syntax — postfix notation
reverse transcriptase — a retrovirus enzyme that synthesizes DNA from viral RNA, the reverse of the usual DNA-to-RNA replication: used in genetic engineering to clone genes from RNA strands.
rio de la plata river — Rí·o de la [ree-aw th e lah] /ˈri ɔ ðɛ lɑ/ (Show IPA) an estuary on the SE coast of South America between Argentina and Uruguay, formed by the Uruguay and Paraná rivers, about 185 miles (290 km) long.
royal victorian order — (in Britain) an order of chivalry founded by Queen Victoria in 1896, membership of which is conferred for special services to the sovereign
saint valentine's day — February 14, observed in honor of St. Valentine as a day for the exchange of valentines and other tokens of affection.
satisficing behaviour — the form of behaviour demonstrated by firms who seek satisfactory profits and satisfactory growth rather than maximum profits
sentential connective — any of several words or their equivalent symbols used in logical formulas to connect propositions, as “or,” “not,” “and,” “if and only if.”.
seven-segment display — (electronics) (SSD) A kind of display element consisting of seven independently controllable lines arranged as a rectangular figure eight. A seven-segment display is the simplest device that can display any of the digits zero to nine (and some other characters) by lighting different combinations of lines. They are often seen in electronic calculators or measuring equipment.
seventeen-year locust — a cicada, Magicicada septendecim, of the eastern U.S., having nymphs that live in the soil, usually emerging in great numbers after 17 years in the North or 13 years in the South.
seventeenth amendment — an amendment to the U.S. Constitution, ratified in 1913, providing for the election of two U.S. senators from each state by popular vote and for a term of six years.
seventh day adventist — Seventh Day Adventist churches are churches that believe that Jesus Christ will return very soon, and that have Saturday as their holy day.
seventh-day adventist — See example at Seventh-Day.
short message service — (messaging) (SMS) A message service offered by the GSM digital mobile telephone system. Using SMS, a short alphanumeric message (160 alphanumeric characters) can be sent to a mobile phone to be displayed there, much like in an alphanumeric pager system. The message is buffered by the GSM network until the phone becomes active.
sieve of eratosthenes — a method of obtaining prime numbers by sifting out the composite numbers from the set of natural numbers so that only prime numbers remain.
snappy video snapshot — (hardware) (registered trademark) A frame grabber for the IBM PC designed and marketed by Play, Inc..
sovereign wealth fund — an investment fund created using the financial assets of a national government
steady state universe — a universe described by the steady state theory.
surface acoustic wave — an acoustic wave generated on the surface of a piezoelectric substrate: used as a filter in electronic circuits
surface of revolution — a surface formed by revolving a plane curve about a given line.
sympathetic vibration — a vibration induced by resonance.
take under advisement — to consider carefully
television evangelist — a Christian minister who devotes time to preaching on television
temperature inversion — inversion (def 12).
the barber of seville — Italian Il barbiere di Siviglia. a comic opera (1816) by Gioacchino Rossini based on a comedy (1775) by Beaumarchais.
the central provinces — the Canadian provinces of Ontario and Quebec
the executive mansion — the White House
the household cavalry — a group of British soldiers on horseback who have the job of protecting the king or queen and their family
the lower vertebrates — relatively simple and primitive vertebrates
the probation service — a criminal justice service that is mainly responsible for dealing with offenders by placing them under the supervision of a probation officer
threatening behaviour — intimidation or intentional behaviour that causes another person to fear injury or harm
throw sb a curve ball — If someone throws you a curve or throws you a curve ball, they surprise you by doing something that you do not expect.
throw someone a curve — a continuously bending line, without angles.
to be on an even keel — If you say that someone or something is on an even keel, you mean that they are working or progressing smoothly and steadily, without any sudden changes.
to give the game away — If someone or something gives the game away, they reveal a secret or reveal their feelings, and this puts them at a disadvantage.
to have green fingers — If someone has green fingers, they are very good at gardening and their plants grow well.
to have money to burn — If you say that someone has money to burn, you mean that they have more money than they need or that they spend their money on things that you think are unnecessary.
to live hand to mouth — If someone lives hand to mouth or lives from hand to mouth, they have hardly enough food or money to live on.
to move the goalposts — If you accuse someone of moving the goalposts, you mean that they have changed the rules in a situation or an activity, in order to gain an advantage for themselves and to make things difficult for other people.
to take the long view — If you take the long view, you consider what is likely to happen in the future over a long period, rather than thinking only about things that are going to happen soon.
topological invariant — a property of a topological space that is a property of every space related to the given space by a homeomorphism.
total recoverable gas — Total recoverable gas is the amount of gas which is still left in the ground in gas fields that have already been worked.
total recoverable oil — Total recoverable oil is the amount of oil which is still left in the ground in oilfields that have already been worked.
toussaint l'ouverture — François Dominique [frahn-swa dawmee-neek] /frɑ̃ˈswa dɔmiˈnik/ (Show IPA), 1743–1803, Haitian patriot and leader of the Haitian Revolution slave rebellion.
traveling salesperson — a representative of a business firm who travels in an assigned territory soliciting orders for a company's services.
turn state's evidence — If someone who is accused of a crime turns state's evidence, they agree to give evidence in a law court against another person such as a former accomplice, usually in exchange for a reduced sentence for themselves.
uk overseas territory — any of the territories that are governed by the UK but lie outside the British Isles; many were formerly British crown colonies: includes Bermuda, Falkland Islands, and Montserrat

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