18-letter words containing r, e, i, n, s, t

swarm intelligence — the collective behaviour of a group of animals, esp social insects such as ants, bees, and termites, that are each following very basic rules
sweptwing aircraft — an aircraft which has wings that are swept (usually) backwards
symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
sympathetic string — a thin wire string, as in various obsolete musical instruments, designed to vibrate sympathetically with the bowed or plucked strings to reinforce the sound.
synthetic geometry — elementary geometry, as distinct from analytic geometry.
system-programming — a program, as an operating system, compiler, or utility program, that controls some aspect of the operation of a computer (opposed to application program).
take out insurance — take out insurance against something
take sth in stride — If you take a problem or difficulty in stride, you deal with it calmly and easily.
tardive dyskinesia — a disorder characterized by restlessness and involuntary rolling of the tongue or twitching of the face, trunk, or limbs, usually occurring as a complication of long-term therapy with antipsychotic drugs.
technical reserves — Technical reserves are amounts of money set aside to pay for underwriting liabilities.
technical sergeant — a noncommissioned officer ranking below a master sergeant and above a staff sergeant.
temporal summation — the act or process of summing.
terrestrial planet — inner planet.
the bird has flown — the person in question has fled or escaped
the hotel industry — the branch of the services industry which provides hotels
the masurian lakes — a group of lakes in Masuria in NE Poland: scene of Russian defeats by the Germans (1914, 1915) during World War I
the movie industry — the industry that makes entertainment films or movies
the nether regions — the genitals
the northern irish — the people who live in or come from Northern Ireland
the sun also rises — a novel (1926) by Ernest Hemingway.
the three wise men — the wise men from the east who came to do homage to the infant Jesus
the uncircumcision — the gentiles
there's no telling — You use there's no telling to introduce a statement when you want to say that it is impossible to know what will happen in a situation.
thermoluminescence — phosphorescence produced by the heating of a substance.
thioarsenious acid — any of a group of hypothetical acids, H3AsS3, HAsS2, and H4As2S5, known only in the forms of their salts
thirty-second note — a note having 1/32 of the time value of a whole note; demi-semiquaver.
thirty-second rest — a rest equal in value to a thirty-second note.
thorfinn karlsefni — 980–after 1007, Icelandic navigator, explorer, and leader of early colonizing expedition to Vinland, in North America.
threatened species — a species likely, in the near future, to become an endangered species within all or much of its range.
throw oneself into — to propel or cast in any way, especially to project or propel from the hand by a sudden forward motion or straightening of the arm and wrist: to throw a ball.
timber rattlesnake — a rattlesnake, Crotalus horridus horridus, of the eastern U.S., usually having the body marked with dark crossbands.
to bear witness to — If a person or thing bears witness to something, they show or say that it exists or happened.
to cast aspersions — If you cast aspersions on someone or something, you suggest that they are not very good in some way.
to close your mind — If you close your mind to something, you deliberately do not think about it or pay attention to it.
to scrape a living — If you say that someone scrapes a living or scratches a living, you mean that they manage to earn enough to live on, but it is very difficult. In American English, you say they scrape out a living or scratch out a living.
to speak your mind — If you speak your mind, you say firmly and honestly what you think about a situation, even if this may offend or upset people.
torsion-free group — a group in which every element other than the identity has infinite order.
transfinite number — an infinite cardinal or ordinal number.
transient response — A transient response of a circuit is a temporary change in the way that it behaves due to an external excitation, that will disappear with time.
transit instrument — Astronomy. meridian circle.
transit theodolite — a theodolite having a telescope that can be transited.
transition element — any element in any of the series of elements with atomic numbers 21–29, 39–47, 57–79, and 89–107, that in a given inner orbital has less than a full quota of electrons.
translation agency — an organization that provide people to translate speech or writing into a different language
transmission brake — A transmission brake is a brake that operates on the transmission system of a vehicle rather than directly on the wheels.
transporter bridge — a bridge for carrying passengers and vehicles by means of a platform suspended from a trolley.
transrectification — rectification occurring in one circuit as a result of the application of an alternating voltage to another circuit.
transverse section — cross section (def 1).
traveling salesman — a male representative of a business firm who travels in an assigned territory soliciting orders for a company's products or services.
treaty obligations — obligations or duties that must be carried out by a party as according to a treaty they have entered into
triangle of forces — a triangle whose sides represent the magnitudes and directions of three forces whose resultant is zero and which are therefore in equilibrium

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