18-letter words containing a, p, i

stratigraphic trap — A stratigraphic trap is a rock formation that contains hydrocarbons and is sealed by other rock formations.
subatomic particle — physics:
subsidiary company — a company whose controlling interest is owned by another company.
summary proceeding — a mode of trial authorized by statute to be held before a judge without the usual full hearing.
super giant slalom — a slalom race in which the course is longer and has more widely spaced gates than in a giant slalom.
superciliary ridge — browridge.
superior vena cava — See under vena cava.
supporting actress — an actress playing a supporting role
supportive therapy — any treatment, such as the intravenous administration of certain fluids, designed to reinforce or sustain the physiological well-being of a patient
supraorbital ridge — browridge.
surgical appliance — a specialized device used by somebody to relieve a particular medical condition
sustaining program — a radio or television program without a commercial sponsor.
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
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 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.
thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
thiruvananthapuram — a state in SW India: formerly the regions of Travancore and Cochin. 15,005 sq. mi. (38,836 sq. km). Capital: Thiruvananthapuram.
threatened species — a species likely, in the near future, to become an endangered species within all or much of its range.
thrills and spills — If you refer to thrills and spills, you are referring to an experience which is exciting and full of surprises.
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.
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.
to stop at nothing — If you say that someone will stop at nothing to get something, you are emphasizing that they are willing to do things that are extreme, wrong, or dangerous in order to get it.
traditional option — an option that once purchased cannot be resold
traditional policy — a life assurance policy in which the policyholder's premiums are paid into a general fund and his or her investment benefits are calculated according to actuarial formulae
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.

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