18-letter words containing t, e, p, i

supraorbital ridge — browridge.
sweptwing aircraft — an aircraft which has wings that are swept (usually) backwards
sympathetic strike — sympathy strike.
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.
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).
systematic phoneme — a phonological unit in generative phonology representing an underlying form that takes into account the relationship between phonological patterns and morphological variation, as the unit underlying the second vowel in both derive and derivative.
talent competition — a contest in which people compete by showcasing their talents, for example in singing, dancing, acrobatics, etc
talk between ships — TBS (def 1).
teaching equipment — teaching aids
telephone receiver — a device, as in a telephone, that converts changes in an electric current into sound.
telephone sex line — a telephone line operated by a phone-sex worker that offers phone sex to paying customers
television company — a company that broadcasts programmes by television
temporal summation — the act or process of summing.
terrestrial planet — inner planet.
territory of papua — a former territory of Australia, consisting of SE New Guinea and adjacent islands: now part of Papua New Guinea
the baptist church — any of various Protestant churches that believe in the baptism of believers
the bottomless pit — the underworld; hell
the encyclopedists — the writers of the French Encyclopedia (1751-72) edited by Diderot and d'Alembert, which contained the advanced ideas of the period
the family compact — the ruling oligarchy in Upper Canada in the early 19th century
the general public — the people in a society; people in general
the middle passage — the journey across the Atlantic Ocean from the W coast of Africa to the Caribbean: the longest part of the journey of the slave ships sailing to the Caribbean or the Americas
the operative word — If you describe a word as the operative word, you want to draw attention to it because you think it is important or exactly true in a particular situation.
the practicalities — the real facts or details of a situation, as opposed to its theoretical aspects
the-cocktail-party — a play in verse (1950) by T. S. Eliot.
thought experiment — Physics. a demonstration or calculation that is based on the postulates of a theory, as relativity, and that demonstrates or clarifies the consequences of the postulates.
threatened species — a species likely, in the near future, to become an endangered species within all or much of its range.
ticker-tape parade — a parade honoring a visiting dignitary, hero, or the like in which confetti, shredded newspapers, or the like are showered into the streets from buildings along the parade route.
tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
to be tickled pink — If you are tickled pink, you are extremely pleased about something.
to cast aspersions — If you cast aspersions on someone or something, you suggest that they are not very good in some way.
to fall into place — If things fall into place, events happen naturally to produce a situation you want.
to lick into shape — If you lick, knock, or whip someone or something into shape, you use whatever methods are necessary to change or improve them so that they are in the condition that you want them to be in.
to pick and choose — If you pick and choose, you carefully choose only things that you really want and reject the others.
to play favourites — to display favouritism
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.
to spill the beans — If you spill the beans, you tell someone something that people have been trying to keep secret.
torsion-free group — a group in which every element other than the identity has infinite order.
traditional weapon — a weapon having ceremonial tribal significance, such as an assegai or knobkerrie
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.
transporter bridge — a bridge for carrying passengers and vehicles by means of a platform suspended from a trolley.
under-compensation — to compensate or pay less than is fair, customary, or expected.
under-depreciation — decrease in value due to wear and tear, decay, decline in price, etc.
unfair competition — acts done by a seller to confuse or deceive the public with intent to acquire a larger portion of the market, as by cutting prices below cost, misleading advertising, selling a spurious product under a false identity, etc.
unit magnetic pole — the unit of magnetic pole strength equal to the strength of a magnetic pole that repels a similar pole with a force of one dyne, the two poles being placed in a vacuum and separated by a distance of one centimeter.
unit-linked policy — a life-assurance policy, the investment benefits of which are directly in proportion to the number of units in a unit trust purchased on the policyholder's behalf
up to one's tricks — If you say that someone is up to their tricks or up to their old tricks, you disapprove of them because they are behaving in the dishonest or deceitful way in which they typically behave.
upper palaeolithic — the latest of the three periods of the Palaeolithic, beginning about 40 000 bc and ending, in Europe, about 12 000 bc: characterized by the emergence of modern man, Homo sapiens
upper partial tone — overtone (def 1).
vanadium pentoxide — a yellow to red crystalline compound, V 2 O 5 , slightly soluble in water, used as a catalyst for organic reactions, in glass to absorb ultraviolet radiation, and as a photographic developer.

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