15-letter words containing o, y, s, t
- theory of types — a theory advanced by Bertrand Russell to avoid the liar paradox, Russell's paradox, etc, in which a class of expressions or of the entities they represent can all enter into the same syntactic relations
- thermochemistry — the branch of chemistry dealing with the relationship between chemical action and heat.
- thirtysomething — a person in her or his thirties
- to do your best — If you do your best or try your best to do something, you try as hard as you can to do it, or do it as well as you can.
- to play footsie — If someone plays footsie with you, they touch your feet with their own feet, for example under a table, often as a playful way of expressing their romantic or sexual feelings towards you.
- to save the day — If someone or something saves the day in a situation which seems likely to fail, they manage to make it successful.
- toxic psychosis — a psychosis resulting from the toxic effect of chemicals, drugs, or certain intrinsic metabolic states.
- transactionally — the act of transacting or the fact of being transacted.
- translationally — in a manner which uses translation
- transnationally — going beyond national boundaries or interests: a transnational economy.
- traveller's joy — a ranunculaceous Old World climbing plant, Clematis vitalba, having white flowers and heads of feathery plumed fruits
- treaty of paris — a treaty of 1763 signed by Britain, France, and Spain that ended their involvement in the Seven Years' War
- tricotyledonous — having three cotyledons.
- trust territory — a territory under the administrative control of a country designated by the United Nations.
- trypanosomiasis — any infection caused by a trypanosome.
- turkish cypriot — denoting ethnically Turkish inhabitants of Cyprus
- tutorial system — a system of education, especially in some colleges, in which instruction is given personally by tutors, who also act as general advisers of a small group of students in their charge.
- tychonic system — a model for planetary motion devised by Tycho Brahe in which the earth is stationary and at the center of the planetary system, the sun and moon revolve around the earth, and the other planets revolve around the sun.
- tyrwhitt-wilson — Gerald Hugh, 14th Baron Berners [bur-nerz] /ˈbɜr nərz/ (Show IPA), 1883–1950, English composer, painter, and author.
- ultramicroscopy — the use of the ultramicroscope.
- ultrasonography — a diagnostic imaging technique utilizing reflected high-frequency sound waves to delineate, measure, or examine internal body structures or organs.
- un-fortuitously — happening or produced by chance; accidental: a fortuitous encounter.
- unadventurously — in an unadventurous manner
- unapostolically — in an unapostalic manner
- uncomplaisantly — in an uncomplaisant manner
- unconstrainedly — in an unconfined manner
- unpretentiously — without pretension
- unquestioningly — in manner that accepts something without expressing doubt or uncertainty
- untrustworthily — in an untrustworthy manner; not trustworthily
- up to your ears — If you are up to your ears in something, it is taking up all of your time, attention, or resources.
- up to your eyes — If you say that you are up to your eyes in something, you are emphasizing that you have a lot of it to deal with, and often that you are very busy.
- vector analysis — the branch of calculus that deals with vectors and processes involving vectors.
- violinistically — in a violinistic manner
- viscosity index — an arbitrary scale for lubricating oils that indicates the extent of variation in viscosity with variation of temperature.
- voice synthesis — the artificial production of the human voice
- voyeuristically — of, relating to, or characteristic of a voyeur or of voyeurism.
- washington lily — a lily, Lilium washingtonianum, of the western coast of the U.S., having whorled leaves and fragrant, purple-spotted white flowers.
- winter holidays — a period of rest from work or studies taken in winter
- wolf-rayet star — a very hot (35,000–100,000 K) and luminous star in the early stages of evolution, with broad emission lines in its spectrum.
- x window system — (operating system, graphics) A specification for device-independent windowing operations on bitmap display devices, developed initially by MIT's Project Athena and now a de facto standard supported by the X Consortium. X was named after an earlier window system called "W". It is a window system called "X", not a system called "X Windows". X uses a client-server protocol, the X protocol. The server is the computer or X terminal with the screen, keyboard, mouse and server program and the clients are application programs. Clients may run on the same computer as the server or on a different computer, communicating over Ethernet via TCP/IP protocols. This is confusing because X clients often run on what people usually think of as their server (e.g. a file server) but in X, it is the screen and keyboard etc. which is being "served out" to the applications. X is used on many Unix systems. It has also been described as over-sized, over-featured, over-engineered and incredibly over-complicated. X11R6 (version 11, release 6) was released in May 1994. See also Andrew project, PEX, VNC, XFree86.
- x-ray astronomy — the branch of astronomy that studies celestial objects by means of the x-rays emitted by them.
- yeast infection — candida: genital inflammation
- yellow goatfish — a schooling goatfish, Mulloidichthys martinicus, inhabiting the Atlantic Ocean from Florida to Panama.
- yes-no question — a question calling for an answer of yes or no, as Are you ready?
- yes/no question — a question inviting the answer "yes" or "no"
- yosemite valley — a glacial valley in Yosemite National Park in central California, in the Sierra Nevada Mountains. It has an altitude of about 1200 m (4000 ft), with sheer walls rising about another 1200 m (4000 ft).
- youth orchestra — an orchestra that is made up of young musicians
- zoophysiologist — an expert in zoophysiology